Create RFC_TEMPLATE.md

RFC_TEMPLATE.md

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+## Motivation
+
+<!--
+What problem are we trying to solve?
+What use cases are we trying to accommodate?
+(Focus on the problem and save design ideas for the next section.)
+-->
+
+## Design Alternatives
+
+<!--
+How could we accommodate the use cases above?
+Is "do nothing" an option?
+-->
+
+## Design
+
+<!--
+Which design should we implement?
+What are the advantages of this design?
+What are some potential drawbacks of this design?
+-->
+
+### Mock-Up
+
+<!--
+What will this design look like to developers?
+What will this design look like to end users?
+-->
+
+### Concepts
+
+<!--
+How will we teach this design?
+What terminology will work best for the new concepts introduced by this design?
+What existing precedents support the new concepts?
+Where do the concepts set new precedents?
+-->
+
+### Implementation
+
+<!--
+How you would implement the design in Javascript?
+How you would implement the design in C++?
+What parts of the Mapbox GL ecosystem will need to change to accomodate this design?
+Are there any important edge cases?
+-->