docs(bpos): add release-notes-0.9.7.md

docs/release-notes/release-notes-0.9.7.md

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+Elastos.ELA version 0.9.7 is now available from:
+
+  <https://download.elastos.io/elastos-ela/elastos-ela-v0.9.7/>
+
+This is a new major version release.
+
+Please report bugs using the issue tracker at GitHub:
+
+  <https://github.com/elastos/Elastos.ELA/issues>
+
+How to Upgrade
+==============
+
+If you are running version release_v0.9.6 and before, you should shut it down
+and wait until it has completely closed, then just copy over `ela`(on Linux).
+
+However, as usual, config, keystore and chaindata files are compatible.
+
+Compatibility
+==============
+
+Elastos.ELA is supported and extensively tested on operating systems
+using the Linux kernel. It is not recommended to use Elastos.ELA on
+unsupported systems.
+
+Elastos.ELA should also work on most other Unix-like systems but is not
+as frequently tested on them.
+
+As previously-supported CPU platforms, this release's pre-compiled
+distribution provides binaries for the x86_64 platform.
+
+Notable changes
+===============
+
+Fixed an issue with block synchronization getting stuck.
+
+0.9.7 change log
+=================
+
+### Bug Fixes
+
+* **bpos:** fixed an issue with block synchronization getting stuck ([86910f4](https://github.com/elastos/Elastos.ELA/commit/86910f42a73be84a83ab5f9f118bd827bed12827))
+* **bpos:** modify to show vote rights correctly ([5f8f611](https://github.com/elastos/Elastos.ELA/commit/5f8f6113ca1f14f6b5e009d2f9f8d4868a61ecb1))
+* **nft:** fixed an issue with NFT history handling ([145e878](https://github.com/elastos/Elastos.ELA/commit/145e878f84931e753dcbe79dde182e9a30cac121))