Added instructions to build the game from source in the README.

README.md

@@ -1,2 +1,50 @@
-# open-tabletop
-An open-source platform for playing tabletop games in a 3D environment, made with the Godot Engine!
+# OpenTabletop
+An open-source platform for playing tabletop games in a 3D environment, made
+with the Godot Engine!
+
+# Compiling
+
+To build the game from source, you'll need to download and compile a slightly
+modified version of the Godot Engine - the reason is because the game needs the
+ability to import resources like textures at runtime which, firstly, isn't
+available in GDScript, and secondly, isn't available outside of the editor.
+
+1. Download the modified version of Godot:
+
+```bash
+git clone https://github.com/drwhut/godot.git -b tabletop-3.2.2
+cd godot
+git submodule update --init
+```
+
+2. Compile Godot for your platform (see
+[the Godot documentation](https://docs.godotengine.org/en/stable/development/compiling/index.html)
+for more information):
+
+```bash
+# For the Editor + Debug Export Template, use:
+scons -j8 platform=windows/osx/x11/server target=release_debug
+
+# For the Release Export Template, use:
+scons -j8 platform=windows/osx/x11/server target=release
+```
+
+3. Download the game:
+
+```bash
+cd ..
+git clone https://github.com/drwhut/open-tabletop.git
+cd open-tabletop
+```
+
+4. Generate the OpenTabletop assets:
+
+```bash
+pip install Pillow
+cd assets/OpenTabletop/cards
+python generate_cards.py
+cd ../chips
+python generate_chips.py
+```
+
+5. Open the built editor, and import the project at `open-tabletop/game`!