add release notes template

RELEASE_NOTES.md

@@ -0,0 +1,27 @@
+<!--
+  A release notes template that should be adapted for every release
+    - release: <v*.*.*>
+    - release branch: <v*.*.x>
+    - the last release: <v-last> 
+    - the last release branch: <v-last.x>
+-->
+
+# Replicated Security <v*.*.*>  Release Notes 
+
+## 📝 Changelog
+
+Check out the [changelog](https://github.com/cosmos/interchain-security/blob/<v*.*.*>/CHANGELOG.md) for a list of relevant changes or [compare all changes](https://github.com/cosmos/interchain-security/compare/release/<v-last>...<v*.*.*>) from last release.
+
+<!-- Add the following line for major releases -->
+Refer to the [upgrading guide](https://github.com/cosmos/interchain-security/blob/release/<v*.x>/UPGRADING.md) when migrating from `<v-last.x>` to `<v*.x>`.
+
+## 🚀 Highlights
+
+<!-- Add any highlights of this release -->
+
+## ❤️ Contributors
+
+* Informal Systems ([@informalinc](https://twitter.com/informalinc))
+
+This list is non-exhaustive and ordered alphabetically.  
+Thank you to everyone who contributed to this release!