Add Compiling.md (partial)

COMPILING.md

@@ -0,0 +1,62 @@
+# Compiling GoZen
+
+This guide will help you compile the GoZen gdextension.
+
+## Step 1: Installing dependencies
+
+### Linux
+
+### Windows
+
+- Install Msys2 from [www.msys2.org](https://www.msys2.org/)
+- Add `path\to\msys64\mingw64\bin` and `path\to\msys64\usr\bin` to the `Path` environment variable. The default installation path is `C:\msys64\`
+
+- Update all packages by executing the following command in the terminal:
+
+    ```bash
+    pacman -Suy
+    ```
+
+    **Note:** In some cases pacman will prompt you to close all terminals. After confiming start a new terminal and re-run the above command.
+
+- Install the required dependencies using the following command:
+
+    ```bash
+    pacman -S mingw-w64-cross-binutils mingw-w64-x86_64-toolchain mingw-w64-x86_64-scons mingw-w64-x86_64-yasm diffutils make
+    ```
+
+## Step 2: Cloning repositories
+
+- Open a terminal in the desired directory and clone the Gozen repository
+
+    ```bash
+    git clone --recurse-submodules https://github.com/VoylinsGamedevJourney/GoZen.git
+    ```
+
+- Move to the Gozen directory
+
+    ```bash
+    cd GoZen
+    ```
+
+- Clone the Godot-cpp repository
+
+    ```bash
+    git clone https://github.com/godotengine/godot-cpp.git src/bin/gde_ffmpeg/godot-cpp
+    ```
+
+## Step 3: Compiling and editing the project
+
+- Execute the build script
+
+    ```bash
+    sh build.sh
+    ```
+
+    **Note:** You will need to compile ffmpeg at least once. Enter `y` when prompted.
+
+- Once the build is complete, you can now open the Godot project located in `./src` directory
+
+    ```bash
+    cd src && /path/to/godot -e .
+    ```