Add description

README.md

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 # 3rd-build-ga
 
-Build 3rd on GitHub Actions
+All binaries that used in [Amnezia-VPN](https://github.com/amnezia-vpn) project built in this repository.
+
+### Usage
+
+This repository contains GitHub Action for each project module. 
+
+Build action is triggered by commit message with build type.
+
+### Build types
+
+Build all modules:
+- [all]
+
+Build all modules on specific platform:
+- [linux]
+- [macos]
+- [windows]
+- [android]
+- [ios]
+
+Build specific module for all platform:
+- [awg]
+- [xray]
+- [cloak]
+- [libssh]
+- [openssl]
+- [openvpn]
+- [openvpnadapter]
+- [shadowsocks]
+- [tun2socks]
+
+Build module for defined platform:
+- [macos-awg]
+- [linux-awg]
+- [ios-awg]
+- [android-awg]
+- [windows-awg]
+- [android-libssh]
+- [ios-libssh]
+- [linux-libssh]
+- [windows-libssh]
+- [macos-libssh]
+- [android-openssl]
+- [linux-openssl]
+- [macos-openssl]
+- [ios-openssl]
+- [windows-openssl]
+- [android-openvpn]
+- [linux-openvpn]
+- [macos-openvpn]
+- [windows-openvpn]
+- [openvpnadapter-macos]
+- [android-shadowsocks]
+- [linux-shadowsocks]
+- [ios-xray]
+- [android-xray]
+
+### Release 
+
+You need to make a release from your action if you want to use built output in main repository. 
+
+We use tags for Release job start. Just put a tag on commit message to store your built output in [GitHub release](https://github.com/amnezia-vpn/3rd-build-ga/releases).
+
+Binaries from [GitHub release](https://github.com/amnezia-vpn/3rd-build-ga/releases) can be uploaded into [3rd-prebuilt](https://github.com/amnezia-vpn/3rd-prebuilt) with sha256 sum and then you can update [3rd-prebuilt](https://github.com/amnezia-vpn/3rd-prebuilt) in main repository. 
+