Create INSTALL_Darwin.md

Author: TimGoTheCreator

INSTALL_Darwin.md

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+# 🍏 Building NEXT on macOS
+
+## Prerequisites
+
+- Git
+- CMake ≥ 3.10
+- Clang
+- OpenMP
+- HDF5
+- Python 3
+
+## Steps
+
+1. **Clone the repository**
+
+```bash
+git clone https://github.com/TimGoTheCreator/NEXT.git
+cd NEXT
+```
+
+2. **Install dependencies using Homebrew**
+
+brew update
+brew install llvm libomp hdf5 python
+
+3. **Build NEXT**
+
+```bash
+mkdir build
+cd build
+cmake .. -DCMAKE_C_COMPILER=/opt/homebrew/opt/llvm/bin/clang -DCMAKE_CXX_COMPILER=/opt/homebrew/opt/llvm/bin/clang++
+cmake --build . --config Release
+cd ..
+```
+
+4. **Run a built-in example simulation**
+
+```bash
+cd examples/TwoBodies
+python two_body.py
+../../next two_body.txt 8 0.01 0.1 vtu
+```
+
+5. **View results**
+
+Open the `.vtu` output in ParaView.