Include clib's package reference. This PR introduces a new top-level file, `package.json`, which enables this repository compatibility with [`clib`](https://github.com/clibs/clib), an open source C package manager. By doing this, users of `clib` can quickly include the `libgit2` library within their project.
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..d33f31c
--- /dev/null
+++ b/package.json
@@ -0,0 +1,7 @@
+{
+ "name": "libgit2",
+ "version": "0.27.0",
+ "repo": "https://github.com/libgit2/libgit2",
+ "description": " A cross-platform, linkable library implementation of Git that you can use in your application.",
+ "install": "mkdir build && cd build && cmake .. && cmake --build ."
+}