Updated Building for macOS (markdown)

Building-for-macOS.md

@@ -13,12 +13,20 @@ You'll need to download and install the following to build yuzu:
 
 ### Cloning yuzu with Git
 
+**Master:**
 ```bash
 git clone --recursive https://github.com/yuzu-emu/yuzu
 cd yuzu
 git submodule update --init --recursive
 ```
 
+**Mainline (no assert):**
+```bash
+git clone --recursive https://github.com/yuzu-emu/yuzu-mainline
+cd yuzu-mainline
+git submodule update --init --recursive
+```
+
 ### Using CMake
 
 First of all, you have to tell CMake where Qt5 is installed (add this line to ~/.profile if you want to make this permanent):