Revert accidental deletion of TEMPLATE.md

rfcs/TEMPLATE.md

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+# Feature name
+
+## Summary
+
+One paragraph explanation of the feature.
+
+## Motivation
+
+Why are we doing this? What use cases does it support? What is the expected outcome?
+
+## Design
+
+This is the bulk of the proposal. Explain the design in enough detail for somebody familiar with the language to understand, and include examples of how the feature is used.
+
+## Drawbacks
+
+Why should we *not* do this?
+
+## Alternatives
+
+What other designs have been considered? What is the impact of not doing this?