doc: add project links

doc/src/README.md

@@ -13,3 +13,15 @@ built, installed and running with minimal effort for consumers of a Garden file.
 Garden sits above any individual project's build scripts and conventions.
 Garden is all about making it easy to remix and reuse libraries maintained
 in seperate Git repositories.
+
+### Project Links
+
+* [Garden source code repository](https://gitlab.com/garden-rs/garden)
+
+* [Garden crates.io package](https://crates.io/crates/garden-tools)
+
+* [Garden Homebrew formula](https://gitlab.com/garden-rs/homebrew-garden)
+
+* [Garden NetBSD pkgsrc](https://cdn.netbsd.org/pub/pkgsrc/current/pkgsrc/devel/garden/index.html)
+
+* [Garden API Documentation](https://docs.rs/garden-tools)