Created Installation methods (markdown)

Installation-methods.md

@@ -0,0 +1,93 @@
+
+#### MacOS
+  * On MacOs, a brew installation script can be found [here.](https://github.com/grumpycoders/pcsx-redux#macos)  
+#### Windows 10  
+  * Native build :  
+  Follow the [instructions here](https://github.com/grumpycoders/pcsx-redux#windows) to build pcsx-redux or download a pre-compiled [pcsx-redux binary here](https://github.com/grumpycoders/pcsx-redux/#where).
+  * Win 10 + WSL2 (needs GUI support):  
+  Install WSL2 with GUI support and [Ubuntu 20.04](https://www.microsoft.com/en-gb/p/ubuntu-2004-lts/9n6svws3rx71?activetab=pivot:overviewtab) then launch a GNU/Linux terminal, then proceed with the following instructions.  
+   
+  * Alternatively on Windows, if you don't care about getting/compiling pcsx-redux, you can skip steps 1, 3 and 4, get the latest precompiled toolchain from here : [http://static.grumpycoder.net/pixel/mips/](http://static.grumpycoder.net/pixel/mips/), unzip it somewhere and [add the `bin` folder to your PATH](https://stackoverflow.com/questions/44272416/how-to-add-a-folder-to-path-environment-variable-in-windows-10-with-screensho#44272417). Then go on with steps 5 and 6.
+#### GNU/Linux
+  1. Install the needed software packages ( aka dependencies in Linux world ) :  
+  
+   * To be able to build PsyQ code, you only need the MIPS toolchain :  
+   
+```bash
+sudo apt-get install gcc-mipsel-linux-gnu g++-mipsel-linux-gnu binutils-mipsel-linux-gnu
+```
+
+   * If you want to compile pcsx-redux, you need a few more packages :  
+   
+```bash
+sudo apt-get install -y git make pkg-config clang g++ libfreetype6-dev libavcodec-dev libavformat-dev libavutil-dev libglfw3-dev libsdl2-dev libswresample-dev libuv1-dev zlib1g-dev
+```
+
+See [here](https://github.com/grumpycoders/pcsx-redux#gnulinux-dependencies) if you're using an Arch derivative.
+
+  2. Clone the pcsx-redux repo : 
+  
+```bash
+git clone https://github.com/grumpycoders/pcsx-redux.git --recursive
+```
+
+  3. Enter pcsx-redux folder:
+```bash
+cd pcsx-redux
+```
+
+  4. Compile pcsx-redux : 
+  
+```bash 
+make
+```
+
+If you encounter an error due to an old version of GCC (< 10) like something about `-fcoroutines`, then you can use **clang** ( min version 9) to compile `pcsx-redux` :
+
+```bash
+
+CC=clang CXX=clang++ LD=clang++ make
+```
+  
+  5. Get the converted [PsyQ 4.7 libs](http://psx.arthus.net/sdk/Psy-Q/psyq-4.7-converted-full.7z) : 
+  
+```bash
+wget http://psx.arthus.net/sdk/Psy-Q/psyq-4.7-converted-full.7z
+```
+  
+  6. Extract this archive to `[...]pcsx-redux/src/mips/psyq/`, adapting the path ( the part after `-o`)  in the command below to the folder you cloned pcsx-redux in :
+
+```bash
+7z x -o./src/mips/psyq/ psyq-4.7-converted-full.7z
+```
+
+Your `pcsx-redux/src/mips/psyq/` directory should now contain an `include` and a `lib` folder with a bunch of files in each of them :
+    
+```bash 
+$tree ~/pcsx-redux/src/mips/psyq/
+.
+├── include
+│   ├── abs.h
+│   ├── ...
+│   ├── strings.h
+│   └── sys
+│       ├── errno.h
+│       ├── ...
+│       └── types.h
+├── lib
+│   ├── libapi.a
+│   ├── ...
+│   └── libtap.a
+└── tree
+
+3 directories, 82 files
+```
+  
+  7. That's it ! After that you can check everything's working by trying to compile some example code :
+  
+```bash 
+cd src/mips/psyq/cube
+make 
+```
+
+You should know have a 'cube.ps-exe' file in the folder. This is a PSX executable you can load with most emulators.