Create CONTRIBUTING.md (#117)

.github/CONTRIBUTING.md

@@ -0,0 +1,18 @@
+# Contributing
+
+There are many ways you can contribute, even if you don't know how to code.
+
+## Submit Bug Reports / Feature Requests
+
+Simply [create a new issue](https://github.com/ryonakano/pinit/issues/new) describing your problem and how to reproduce or your suggestion. If you are not used to do, [this section](https://docs.elementary.io/contributor-guide/feedback/reporting-issues) is for you.
+
+## Propose Coding Changes
+
+We follow [the coding style of elementary OS](https://docs.elementary.io/develop/writing-apps/code-style). Try to respect them.
+
+## Translate the Project
+
+We accept translations through Weblate:
+
+- [pinit-app](https://hosted.weblate.org/projects/rosp/pinit-app/): Texts in the app itself
+- [pinit-metainfo](https://hosted.weblate.org/projects/rosp/pinit-metainfo/): Texts in the desktop entry and the software center

README.md

@@ -47,11 +47,14 @@ ninja install -C builddir
 com.github.ryonakano.pinit
 ```
 
-## Help Translation of This Project!
-We accept translations of this project through [Weblate](https://weblate.org/). We would appreciate it if you would join our translation work!
+## Contributing
 
-Click the following graphs to get started:
+Please refer to [the contribution guideline](.github/CONTRIBUTING.md) if you would like to:
 
-| App: Texts in the app itself | Metainfo: Texts in the desktop entry and the software center |
-| --- | --- |
-| [![Translation status](https://hosted.weblate.org/widgets/rosp/-/pinit-app/multi-auto.svg)](https://hosted.weblate.org/projects/rosp/pinit-app) | [![Translation status](https://hosted.weblate.org/widgets/rosp/-/pinit-metainfo/multi-auto.svg)](https://hosted.weblate.org/projects/rosp/pinit-metainfo) |
+- submit bug reports / feature requests
+- propose coding changes
+- translate the project
+
+## Get Support
+
+Need help in use of the app? Refer to [the discussions page](https://github.com/ryonakano/pinit/discussions) to search for existing discussions or [start a new discussion](https://github.com/ryonakano/pinit/discussions/new/choose) if none is relevant.