Add README.md

Author: marler8997

README.md

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+# ninja
+
+Builds [ninja](https://ninja-build.org) with [Zig](https://ziglang.org).
+
+Prebuilt binaries are published to [Releases](https://github.com/allyourcodebase/ninja/releases).
+Unlike upstream, the prebuilt linux binaries are built statically so they'll work on any
+linux distro.