Update README.md and LICENSE

Editor/BetterSingletons.Editor.asmdef

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+{
+    "name": "BetterSingletons.Editor",
+    "rootNamespace": "Better.Singletons",
+    "references": [
+        "GUID:af7fffdf1d83bc842b0f6e3a01efda16"
+    ],
+    "includePlatforms": [
+        "Editor"
+    ],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [],
+    "noEngineReferences": false
+}

LICENSE

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+MIT License
+
+Copyright (c) 2022 Arcueid D'athemon (https://github.com/uurha)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Better Singletons
+
+## Install
+[How to install](https://github.com/uurha/BetterPluginCollection/wiki/How-to-install)

Runtime/BetterSingletons.Runtime.asmdef

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+{
+    "name": "BetterSingletons.Runtime",
+    "rootNamespace": "Better.Singletons",
+    "references": [
+        "GUID:28da8d3b12e3efa47928e0c9070f853d"
+    ],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [],
+    "noEngineReferences": false
+}

Runtime/MonoSingleton.cs

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+using System;
+using System.Collections.Generic;
+using Better.Extensions.Runtime;
+using UnityEngine;
+using Object = UnityEngine.Object;
+
+namespace Better.Singletons.Runtime
+{
+    public abstract class MonoSingleton<T> : MonoBehaviour where T : MonoSingleton<T>
+    {
+        private static T _instance;
+
+        public static T Instance
+        {
+            get
+            {
+                ValidateInstance();
+                return _instance;
+            }
+        }
+
+        private static void ValidateInstance()
+        {
+            var typeName = typeof(T).Name;
+            if (_instance != null)
+            {
+                return;
+            }
+
+            var objects = FindObjectsOfType<T>();
+
+            if (objects.IsNullOrEmpty())
+            {
+                throw new InvalidOperationException($"[{typeName}] {nameof(ValidateInstance)}: no instance found");
+            }
+
+            _instance = objects[0];
+
+            if (objects.Length > 1)
+            {
+                Debug.LogWarning($"[{typeName}] {nameof(ValidateInstance)}: more than one instance found. Destroying other instances");
+
+                var others = new List<T>(objects);
+                others.Remove(_instance);
+
+                //TODO: Maybe add settings to destroy or reassign instance
+                foreach (var item in others)
+                {
+                    Destroy(item.gameObject);
+                }
+            }
+        }
+    }
+}

Runtime/PocoSingleton.cs

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+using System;
+
+namespace Better.Singletons.Runtime
+{
+    [Serializable]
+    public abstract class PocoSingleton<T> where T : PocoSingleton<T>, new()
+    {
+        private static T _instance;
+
+        public static T Instance
+        {
+            get
+            {
+                if (_instance == null)
+                {
+                    _instance = new T();
+                }
+
+                return _instance;
+            }
+        }
+    }
+}

Runtime/ScriptableSingletonAsset.cs

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+using System;
+using Better.Extensions.Runtime;
+using UnityEditor;
+using UnityEngine;
+
+namespace Better.Singletons.Runtime
+{
+    public abstract class ScriptableSingletonAsset<T> : ScriptableObject where T : ScriptableSingletonAsset<T>
+    {
+#if UNITY_EDITOR
+
+        private static T _assetInstance;
+
+        public static T AssetInstance
+        {
+            get
+            {
+                if (_assetInstance == null)
+                {
+                    _assetInstance = FindAsset();
+                }
+
+                return _assetInstance;
+            }
+        }
+
+        private static T FindAsset()
+        {
+            var typeName = typeof(T).Name;
+            var filter = $"t:{typeName}";
+            var guids = AssetDatabase.FindAssets(filter);
+
+            if (guids.IsNullOrEmpty())
+            {
+                throw new InvalidOperationException($"[{typeName}] {nameof(FindAsset)}: no asset found");
+            }
+
+            if (guids.Length > 1)
+            {
+                Debug.LogWarning($"[{typeName}] {nameof(FindAsset)}: more than one asset found");
+            }
+
+            //TODO: Add BetterResources or AssetDatabaseUtility
+            var assetPath = AssetDatabase.GUIDToAssetPath(guids[0]);
+            return AssetDatabase.LoadAssetAtPath<T>(assetPath);
+        }
+
+#endif
+    }
+}

package.json

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+{
+  "name": "com.tdw.better.singletons",
+  "displayName": "Better Singletons",
+  "version": "0.0.1",
+  "unity": "2021.3",
+  "description": " ",
+  "dependencies": {
+    "com.uurha.betterextensions": "1.1.99"
+  },
+  "author": {
+    "name": "Better Plugins",
+    "url": "https://github.com/techno-dwarf-works"
+  },
+  "changelogUrl": "https://github.com/techno-dwarf-works/better-singletons",
+  "documentationUrl": "https://github.com/techno-dwarf-works/better-singletons/tree/main#readme",
+  "license": "MIT",
+  "licensesUrl":"https://github.com/techno-dwarf-works/better-singletons/blob/main/LICENSE",
+  "keywords": [
+    "data management",
+    "referencing",
+    "pattern",
+    "patterns"
+  ]
+}