Add building instructions

Author: tmthecoder

README.md

@@ -21,3 +21,52 @@ All you need to do is add the import statement to use for Swift:
 ``` 
 import WebRTC
 ```
+
+## Building
+To Build your own WebRTC Framework, similar to the one I have build,
+the instructions are as follows:
+
+Clone the WebRTC Source:
+
+```
+git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
+export PATH=$PATH:/path/to/depot_tools
+
+fetch --nohooks webrtc_ios
+
+gclient sync
+```
+
+Generate the macOS Targets (x86_64 and arm64)
+
+```
+gn gen out/mac_x64 --args='target_os="mac" target_cpu="x64" is_component_build=false is_debug=false rtc_libvpx_build_vp9=false enable_stripping=true rtc_enable_protobuf=false'
+
+gn gen out/mac_arm64 --args='target_os="mac" target_cpu="arm64" is_component_build=false is_debug=false rtc_libvpx_build_vp9=false enable_stripping=true rtc_enable_protobuf=false'
+
+```
+
+Build both frameworks:
+
+```
+ninja -C out/mac_x64 mac_framework_objc
+
+ninja -C out/mac_arm64 mac_framework_objc
+```
+
+Merge the frameworks using `lipo`:
+
+```
+cd ..
+
+cp -R src/out/mac_x64/WebRTC.framrwork WebRTC.framework
+
+lipo -create -output WebRTC.framework/WebRTC src/out/macos_x64/WebRTC.framework/WebRTC src/out/macos_arm64/WebRTC.framework/WebRTC
+```
+The outputted `WebRTC.franework` can be imported into an Xcode Project and will support both Intel and Apple Silicon Macs
+
+## Licensing
+
+- This port of WebRTC, and any changes that maybe made by me will fall under the [MIT License](https://github.com/tmthecoder/WebRTC-macOS/blob/main/LICENSE)
+
+- WebRTC's license can be found [here](https://github.com/tmthecoder/WebRTC-macOS/blob/main/LICENSE)