added miner repo

rin/miner/build-windows.md

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+# Building cpuminer-opt-rinhash on Windows
+
+## Prerequisites
+
+1. Install MSYS2 from https://www.msys2.org/
+2. Open MSYS2 terminal and install build dependencies:
+
+```bash
+# Update package database
+pacman -Syu
+
+# Install build tools and dependencies
+pacman -S mingw-w64-x86_64-gcc mingw-w64-x86_64-make mingw-w64-x86_64-curl mingw-w64-x86_64-jansson mingw-w64-x86_64-openssl mingw-w64-x86_64-gmp mingw-w64-x86_64-zlib mingw-w64-x86_64-autotools mingw-w64-x86_64-pkg-config
+```
+
+## Build Process
+
+1. Open MSYS2 MinGW 64-bit terminal (not the regular MSYS2 terminal)
+2. Navigate to the cpuminer directory
+3. Run the build commands:
+
+```bash
+cd /f/projects/mines/rin/miner/cpuminer
+./autogen.sh
+./configure CFLAGS="-O3 -march=native -funroll-loops -fomit-frame-pointer"
+make -j$(nproc)
+```
+
+## Alternative: Use Pre-built Binary
+
+Since the repository already contains Windows DLLs and object files, you might be able to complete the build with just the linking step.
+
+## Test the Miner
+
+Once built, test with:
+```bash
+./cpuminer.exe -a rinhash -o stratum+tcp://your-pool:port -u your-username -p x -t 4
+```