docs: Explain this fork in README

Author: oSumAtrIX

README.md

@@ -13,6 +13,22 @@ microG Services is a FLOSS (Free/Libre Open Source Software) framework to allow
 
 If you'd like to help translate microG, take a look at [TRANSLATION](TRANSLATION.md).
 
+About this fork
+-------
+This repository is a fork of [microG GmsCore](https://github.com/microg/GmsCore) to allow patched Google apps to run without root and under a different package name using GmsCore instead of Google Play Services, via the "GmsCore support" patch by ReVanced from [ReVanced Patches](https://github.com/revanced/revanced-patches) with the minimum amount of changes necessary to upstream.
+
+Goals of this fork:
+- Run next to an existing GMS installation such as [microG GmsCore](https://github.com/microg/GmsCore) or Google Play Services.
+- Usage with the "GmsCore support" patch by ReVanced from [ReVanced Patches](https://github.com/revanced/revanced-patches)
+- Feature parity with upstream
+
+Nongoals of this fork:
+- New features that do not contribute to the goal of this fork
+- Bug fixes that do not contribute to the goal of this fork
+
+Contributing to the fork
+-------
+You can create an issue or pull request to contribute to the fork. In both cases, ensure it aligns with this fork's goals.
 
 License
 -------