Add README

Signed-off-by: PeroSar <perosar1111@gmail.com>

README.md

@@ -0,0 +1,49 @@
+# Emerald GCC
+
+[![Drone CI](https://img.shields.io/drone/build/PeroSar/emerald-gcc?logo=drone&logoColor=blue&server=https%3A%2F%2Fdrone.tildegit.org)](https://drone.tildegit.org/PeroSar/emerald-gcc)
+
+## About
+
+A toolchain to cross compile to Android. This outputs executables that link against Android's libc(bionic).
+This is a personal project.
+
+
+## Why
+
+Android’s GCC was deprecated in favor of LLVM Clang and removed from Android in January 2020.
+Some projects still require GCC for building.
+
+
+## How to use
+
+- Get tarball from latest [gitea release](https://tildegit.org/PeroSar/emerald-gcc/releases)
+- Extract
+
+```bash
+$ tar -xJf file.tar.xz
+```
+
+- Modify PATH
+
+```bash
+$ export PATH="$(pwd)/aarch64-linux-android-emerald/bin:$PATH"
+```
+
+- Test
+
+```bash
+$ aarch64-linux-android-gcc --version
+$ aarch64-linux-android-gcc test.c -o test
+```
+
+- Run on Android (e.g. with Termux)
+
+## Target
+
+Compiled executables should run properly on Android 8 and above.
+
+## Credits
+- Patches from [its-pointless](https://github.com/its-pointless)
+- Patches from [Android GCC 4.9](https://android.googlesource.com/toolchain/gcc)
+- Sysroot from [NDK](https://github.com/android/ndk)
+- Wiki pages from [Termux](https://github.com/termux)