Create contribute.md

contribute.md

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+## Build from source
+
+Hiddify Next relies on [core library](https://github.com/hiddify/hiddify-next-core) made with GO. if you're interested in building/contributing to that as well follow instructions there.
+
+### requirements:
+
+- Flutter v3.13+
+- Make
+- Android SDK
+
+This project uses [flutter_distributor](https://github.com/leanflutter/flutter_distributor) for packaging.
+
+```shell
+# fetch dependencies and build generated files
+$ make get translate gen
+
+# fetch geo assets
+$ make get-geo-assets
+
+for platform in [windows linux macos android]:
+   # fetch native libraries for respective platforms, follow core lib instructions for building
+   $ make $platform-libs
+   $ make release-$platform
+
+# example:
+   $ make windows-libs
+   $ make windows-release
+```