Add the first Soroban RPC changelog

CHANGELOG.md

@@ -0,0 +1,43 @@
+# Changelog 
+
+## Unreleased
+n/a
+
+
+## [v21.1.0](https://github.com/stellar/soroban-rpc/compare/v21.0.1...v21.1.0)
+
+### Added
+* A new `getVersionInfo` RPC endpoint providing versioning info ([#132](https://github.com/stellar/soroban-rpc/pull/132)):
+
+```typescript
+interface getVersionInfo {
+  version: string;
+  commit_hash: string;
+  build_time_stamp: string;
+  captive_core_version: string;
+  protocol_version: number; // uint32
+}
+```
+
+### Fixed
+* Deadlock on events ingestion error ([#167](https://github.com/stellar/soroban-rpc/pull/167)). 
+* Correctly report row iteration errors in `StreamAllLedgers` ([#168](https://github.com/stellar/soroban-rpc/pull/168)). 
+* Increase default ingestion timeout ([#169](https://github.com/stellar/soroban-rpc/pull/169)). 
+* Surface an ignored error in `getRawLedgerEntries()` ([#170](https://github.com/stellar/soroban-rpc/pull/170)). 
+
+
+# Formatting Guidelines
+
+This outlines the formatting expectations for the CHANGELOG.md file.
+
+## [vMajor.Minor.Patch](GitHub compare diff to last version)
+If necessary, drop a summary here (e.g. "This release supports Protocol 420.")
+
+### Breaking Changes come first
+* This is a pull request description and it should be quite detailed if it's a breaking change. Ideally, you would even include a bit of helpful notes on how to migrate/upgrade if that's necessary. For example, if an API changes, you should provide deep detail on the delta.
+
+### Added stuff next
+* Anything added should have a details on its schema or command line arguments ([#NNNN](link to github pr)).
+
+### Fixed bugs last
+* Be sure you describe who is affected and how.