Add rough rudimentary CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to Jerboa
+
+<!-- TOC -->
+* [Contributing to Jerboa](#contributing-to-jerboa)
+  * [Ways to contribute](#ways-to-contribute)
+  * [Application structure](#application-structure)
+  * [Code contributions](#code-contributions)
+    * [Kotlin](#kotlin)
+    * [Code quality](#code-quality)
+  * [Adding translations](#adding-translations)
+<!-- TOC -->
+
+## Ways to contribute
+- Participate here and start answering questions.
+- File GitHub issues for big reports from /c/Jerboa. Watch the project for duplicate reports and link them to the first report so devs can easily close dupes.
+- File new bug reports for issues you find.
+- Add missing translations
+- Code contributions
+
+## Application structure
+- Basic Modern Android Development (https://developer.android.com/series/mad-skills) tech stack (Compose, Navigation, Coroutines, AndroidX)
+- Guide to App Architecture (https://developer.android.com/topic/architecture), without domain layer. Basically, MVVM + Repositories for data access.
+- Manual DI
+
+## Code contributions
+You can open Jerboa in AndroidStudio.
+
+### Kotlin
+This project is full Kotlin. Please do not write Java classes.
+
+### Code quality
+The code must be formatted to a common standard.
+
+To check for violations
+`./gradlew lintKotlin`
+Or just run this to fix them
+`./gradlew formatKotlin`
+
+## Adding translations
+You can find the translations in the `app/src/main/res/values-{locale}/strings.xml` file.
+You can open it in android studio, right click and click open translations editor or you can directly edit the files.