Create release-notes-5377.md

doc/release-notes-5377.md

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+Updated RPCs
+--------
+
+- `protx diff` RPC returns a new field `quorumsCLSigs`.
+This field is a list of: Chainlock signature and the list of corresponding quorum indexes in `newQuorums`.
+
+`MNLISTDIFF` P2P message
+--------
+
+Starting with protocol version `70228`, the following fields is added to the `MNLISTDIFF` after `newQuorums`.
+
+| Field              | Type                  | Size     | Description                                                         |
+|--------------------|-----------------------|----------|---------------------------------------------------------------------|
+| quorumsCLSigsCount | compactSize uint      | 1-9      | Number of quorumsCLSigs elements                                    |
+| quorumsCLSigs      | quorumsCLSigsObject[] | variable | CL Sig used to calculate members per quorum indexes (in newQuorums) |
+
+The content of `quorumsCLSigsObject`:
+
+| Field         | Type             | Size     | Description                                                                                 |
+|---------------|------------------|----------|---------------------------------------------------------------------------------------------|
+| signature     | BLSSig           | 96       | Chainlock signature                                                                         |
+| indexSetCount | compactSize uint | 1-9      | Number of quorum indexes using the same `signature` for their member calculation            |
+| indexSet      | uint16_t[]       | variable | Quorum indexes corresponding in `newQuorums` using `signature` for their member calculation |
+
+Note: The field `quorumsCLSigs` in both RPC and P2P will be populated only after the v20 activation.