Add README.md

README.md

@@ -0,0 +1,89 @@
+Below is a sample **README.md** that explains how to install the necessary **MinGW** dependencies via **MSYS2**’s `pacman` and then build both the DLL and an EXE that depends on it.
+
+```md
+# Snake Ported - SDL2 + OpenGL Test Game (UWP/Windows)
+
+This project builds a DLL (`snake_ported.dll`) that exposes `external_entry()` and `update_controller_input()` for use in a host application. It relies on **SDL2** and **OpenGL** under MinGW-w64 on Windows.
+
+## Prerequisites
+
+Install [MSYS2](https://www.msys2.org/) and update it:
+```
+
+```bash
+pacman -Syu
+```
+
+Close the shell, reopen MSYS2 MinGW 64-bit shell, and update again if prompted:
+
+```bash
+pacman -Syu
+```
+
+Then install the needed packages:
+
+```bash
+pacman -S --needed base-devel \
+  mingw-w64-x86_64-toolchain \
+  mingw-w64-x86_64-SDL2
+```
+
+These packages provide:
+- **GCC/G++** (MinGW toolchain)
+- **SDL2** headers and libraries for 64-bit Windows
+- Basic build tools like `make`
+
+## Building the DLL
+
+Inside the **MinGW64** shell, run:
+
+```bash
+g++ -shared snake_ported.cpp -o snake_ported.dll \
+    -lmingw32 -lSDL2main -lSDL2 -lopengl32 -mwindows
+```
+
+This produces **`snake_ported.dll`** which exports:
+- `external_entry()` to launch the Snake game loop using the host’s OpenGL context.
+- `update_controller_input(...)` to feed controller/keyboard input into the game.
+
+## Building a Standalone EXE (Optional)
+
+If you also have a version of the same code (like the original Snake game) that creates its own window, you can build it as an EXE. For instance:
+
+```bash
+g++ snake.cpp -o snake_exe \
+    -lmingw32 -lSDL2main -lSDL2 -lopengl32 -mwindows
+```
+
+
+
+This will produce a standalone EXE (**`snake_exe`**) that creates an SDL window and runs the game.
+
+## Usage
+
+1. **DLL scenario**: Load `snake_ported.dll` from a host application (C#, Rust, C++, etc.).  
+2. **EXE scenario**: Simply run `snake_exe.exe`.
+
+In the DLL scenario, the host is responsible for:
+- Creating an SDL window and OpenGL context.
+- Calling `external_entry()` once everything is set up.
+- Calling `update_controller_input(...)` with user/controller input data every frame/tick.
+
+## After compilation 
+
+once compiled you should see what your DLL depends on. A good tool for this is [Dependencies](https://github.com/lucasg/Dependencies/releases/download/v1.11.1/Dependencies_x64_Release.zip).
+
+Since unlike traditional C++ devs i don't want to burden you and force you to basically decrypt what it needs i'll tell you what you need to grab from mingw:
+- libstdc++-6.dll
+- libwinpthread-1.dll
+- libgcc_s_seh-1.dll
+
+!!! it might say SDL2.dll is not found that's okay since the host itself will provide a UWP compatible SDL build so you can ignore that.
+
+all these can be found in the following folder:
+
+```
+C:\msys64\mingw64\bin
+```
+
+A host compatible with the DLL can be found [here](https://git.nanodata.cloud/moonpower/sdl-cs-uwp). Simply replace the existing DLL by snake_ported.dll, insert the 3 mingw extra DLLS and see your game boot up!