Create INSTALL_MinGW.md

Author: TimGoTheCreator

INSTALL_MinGW.md

@@ -0,0 +1,50 @@
+# 🖥️ Building NEXT on Windows (MinGW)
+
+## Prerequisites
+
+- Git
+- CMake ≥ 3.10
+- MinGW-w64 GCC
+- MSYS2 environment
+- HDF5 via MSYS2
+- Python 3
+- (Optional) Chocolatey, for automated MSYS2 install
+
+## Steps
+
+1. **Clone the repository**
+
+```bash
+git clone https://github.com/TimGoTheCreator/NEXT.git
+cd NEXT
+```
+
+2. **Install dependencies via MSYS2**
+
+```bash
+choco install msys2 -y
+C:/tools/msys64/usr/bin/pacman -Syu --noconfirm
+C:/tools/msys64/usr/bin/pacman -S --noconfirm mingw-w64-x86_64-hdf5 python
+```
+
+3. **Build NEXT**
+
+```bash
+mkdir build
+cd build
+cmake -G "MinGW Makefiles" -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++ ..
+cmake --build . --config Release
+cd ..
+```
+
+4. **Run a built-in example simulation**
+
+```bash
+cd examples/TwoBodies
+python two_body.py
+../../next.exe two_body.txt 8 0.01 0.1 vtu
+```
+
+5. **View results**
+
+Open the `.vtu` output in ParaView.