Add ambassador submission - David Biesack (#754)

* Add ambassador submission - David Biesack

* add APISpecs conference talk

* Update programs/ambassadors/ambassadors.json

change twitter to mastodon

Co-authored-by: Benjamin Granados <40007659+benjagm@users.noreply.github.com>

* Update ambassadors.json

fix misspelling

---------

Co-authored-by: Benjamin Granados <40007659+benjagm@users.noreply.github.com>

programs/ambassadors/ambassadors.json

@@ -36,6 +36,71 @@
             "month": "April"
           },
           "link": "https://landscape.json-schema.org/"
+    },      
+    {
+      "name": "David Biesack",
+      "img": "https://avatars.githubusercontent.com/u/545944?s=400&u=26818946106e2d8ae8c0cb5e0b72d6c7f612d268&v=4",
+        "bio": "Chief API Officer at APiture (I design banking APIs with OpenAPI 3.1, JSON Schema 2020/12) and author of the API Design Matters blog, https://apidesignmatters.substack.com/ ",
+      "title": "Chief API Officer",
+      "github": "DavidBiesack",
+      "mastodon": "@DavidBiesack@fosstodon.org",
+      "linkedin": "davdbiesack",
+      "company": "Apiture",
+      "country": "🇺🇸",
+      "contributions": [
+        {
+          "type": "article",
+          "title": "Composing API Models with JSON Schema",
+          "date": {
+            "year": 2023,
+            "month": "June"
+          },
+          "link": "https://apidesignmatters.substack.com/p/composing-api-models-with-json-schema"
+        },
+        {
+          "type": "article",
+          "title": "Master JSON Schema's Subtleties",
+          "date": {
+            "year": 2023,
+            "month": "July"
+          },
+          "link": "https://apidesignmatters.substack.com/p/master-json-schemas-subtleties"
+        },
+        {
+          "type": "article",
+          "title": "Master More JSON Schema's Subtleties",
+          "date": {
+            "year": 2023,
+            "month": "July"
+          },
+          "link": "https://apidesignmatters.substack.com/p/master-more-json-schemas-subtleties"
+        },
+        {
+          "type": "article",
+          "title": "Learning the Language of API Data",
+          "date": {
+            "year": 2023,
+            "month": "May"
+          },
+          "link": "https://apidesignmatters.substack.com/p/learning-the-language-of-api-data"
+        },
+        {
+          "type": "pull request review",
+          "title": "What is JSON Schema?",
+          "date": {
+            "year": 2024,
+            "month": "June"
+          },
+          "link": "https://github.com/json-schema-org/website/pull/679"
+        },
+        {
+          "type": "conference-talk",
+          "title": "Wielding the Double-Edged Sword of JSON Schema",
+          "date": {
+            "year": 2022,
+            "month": "Sempember"
+          },
+          "link": "https://www.youtube.com/watch?v=6ukZEUBRpqo"
         }
       ]
     }