Create README.md

Author: liam-teale

README.md

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+# libv5rt-meson
+
+Download, patch, and strip libv5rt.a!
+
+### How it works:
+
+1. downloads the libv5rt SDK ZIP from VEX's own servers
+2. extracts the SDK zip
+3. patches headers so you can use it despite float-abi incompatibilities
+4. strips libv5rt.a so you can use libm's crt0
+5. creates a new archive, libv5.a, so it plays nice with meson
+
+### Dependencies:
+
+- arm-none-eabi-gcc
+- python3