initial RELEASE.md (#1244)

initial RELEASE.md and RELEASE_TEMPLATE.md

.github/RELEASE_TEMPLATE.md

@@ -0,0 +1,28 @@
+# Release v0.X.Y <milestone name>
+
+fun blurb about the name, what's in the release
+
+## Major Features And Improvements
+
+* bulleted
+* list of features and improvements
+
+## Breaking Changes
+
+* bulleted
+* list
+* of
+* protocol changes/breaks
+* API breaks
+* CLI changes
+* etc.
+
+## Bug Fixes and Other Changes
+
+* can be pulled from commit log, or synthesized
+
+## Thanks to our Contributors
+
+This release contains contributions from many people at Solana, as well as:
+
+  pull from commit log