docs: add REPO to readme

Author: hacdias

Diff for: README.md

@@ -82,7 +82,7 @@ test.all(common)
 
 ## API
 
-In order to be considered "valid", an IPFS core implementation  must expose the API described in [/API](/API). You can also use this loose spec as documentation for consuming the core APIs. Here is an outline of the contents of that directory:
+In order to be considered "valid", an IPFS core implementation  must expose the API described in [/SPEC](/SPEC). You can also use this loose spec as documentation for consuming the core APIs. Here is an outline of the contents of that directory:
 
 - **Files**
   - [files](/SPEC/FILES.md)
@@ -101,6 +101,7 @@ In order to be considered "valid", an IPFS core implementation  must expose the
 - **Node Management**
   - [Miscellaneous](/SPEC/MISCELLANEOUS.md)
   - [config](/SPEC/CONFIG.md)
+  - [repo](/SPEC/REPO.md)
 
 ## Contribute