Create INSTALL_MSVC.md

Author: TimGoTheCreator

INSTALL_MSVC.md

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+# 🖥️ Building NEXT on Windows (MSVC)
+
+## Prerequisites
+
+- Git
+- CMake ≥ 3.10
+- Visual Studio 2022 with C++ workload
+- vcpkg
+- HDF5 (installed via vcpkg)
+- Python 3
+
+## Steps
+
+1. **Clone the repository**
+
+```powershell
+git clone https://github.com/TimGoTheCreator/NEXT.git
+cd NEXT
+```
+
+2. **Install vcpkg and HDF5**
+
+```powershell
+git clone https://github.com/microsoft/vcpkg.git C:/vcpkg
+C:/vcpkg/bootstrap-vcpkg.bat
+C:/vcpkg/vcpkg install hdf5[hl]:x64-windows
+```
+
+3. **Build NEXT**
+
+```powershell
+mkdir build
+cd build
+cmake -G "Visual Studio 17 2022" -A x64 -DCMAKE_TOOLCHAIN_FILE=C:/vcpkg/scripts/buildsystems/vcpkg.cmake ..
+cmake --build . --config Release
+cd ..
+```
+
+4. **Run a built-in example simulation**
+
+```powershell
+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.