Add dependencies to individual modules.

src/media/audio/README.md

@@ -0,0 +1,9 @@
+# Optional Dependencies
+
+## Linux
+
+### ALSA
+
+```bash
+sudo apt-get install libasound2-dev
+```

src/media/image/README.md

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+# Optional Dependencies
+
+## Linux
+
+### libPNG
+
+```bash
+sudo apt-get install libpng-dev
+```

src/rendering/fonts/README.md

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+# Optional Dependencies
+
+## Linux
+
+### Freetype
+
+```bash
+sudo apt-get install libfreetype-dev
+```

src/rendering/graphics/README.md

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+# Optional Dependencies
+
+## Linux
+
+### OpenGL
+
+```bash
+sudo apt-get install libgl-dev libegl1-mesa-dev libglu1-mesa-dev libglm-dev
+```

src/ui/windows/README.md

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+# Optional Dependencies
+
+## Linux
+
+### X and XCB
+
+```bash
+sudo apt-get install libx11-dev libxkbcommon-dev libxkbcommon-x11-dev libx11-xcb-dev libxcb-image0-dev
+```
+
+### Wayland
+
+```bash
+sudo apt-get install libwayland-dev wayland-protocols libx11-dev libxkbcommon-dev libxkbcommon-x11-dev libx11-xcb-dev libxcb-image0-dev
+```
+
+In addition, we need to generate suitable xdg shell c code:
+
+```bash
+mkdir $WORK_DIR
+cd $WORK_DIR
+wayland-scanner private-code < /usr/share/wayland-protocols/stable/xdg-shell/xdg-shell.xml > xdg-shell-protocol.cpp
+wayland-scanner client-header < /usr/share/wayland-protocols/stable/xdg-shell/xdg-shell.xml > xdg-shell-client-protocol.h
+export WAYLAND_EXTENSION_DIR=$WORK_DIR
+```
+
+In `xdg-shell-protocol.cpp` - we need access to `xdg_wm_base_interface` so export it also `extern const struct wl_interface xdg_wm_base_interface;` as per similar interface structs.