Explicitly require a public repository for Stage 1

Stage 1 already had various entrance criteria (such as prose outlining the problem, the shape of the solution, examples of usage, the high-level API, etc.), which in practice are expected to be made accessible through a publicly available repository.

This patch explicitly makes the repository a requirement for Stage 1 advancement.

Author: mathiasbynens

index.html

@@ -74,6 +74,7 @@ <h2>Development</h2>
         <li>High-level API
         <li>Discussion of key algorithms, abstractions and semantics
         <li>Identification of potential “cross-cutting” concerns and implementation challenges/complexity
+        <li>A publicly available repository for the proposal that captures the above requirements
       </ul>
     </td>
     <td>The committee expects to devote time to examining the problem space, solutions and cross-cutting concerns