Add subcoin-milestone-3 (#1207)

deliveries/subcoin-milestone-3.md

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+# Milestone Delivery :mailbox:
+
+**The delivery is according to the official [milestone delivery guidelines](https://github.com/w3f/Grants-Program/blob/master/docs/Support%20Docs/milestone-deliverables-guidelines.md).**  
+
+* **Application Document:** https://github.com/w3f/Grants-Program/blob/master/applications/Subcoin.md
+* **Milestone Number:** 3
+
+**Deliverables**
+
+| Number | Deliverable                      | Link | Notes |
+| ---    | ---                              | --- | --- |
+| 0a.    | License                          | https://github.com/subcoin-project/subcoin/blob/subcoin-milestone-3/LICENSE | |
+| 0b.    | Documentation                    | Each module has its own docs. The rendered inline rustdoc is deployed at https://subcoin-project.github.io/subcoin/. | |
+| 0c.    | Testing and Testing Guide        | Install rust on your system and use this command to run tests: https://github.com/subcoin-project/subcoin/tree/subcoin-milestone-3?tab=readme-ov-file#run-tests | |
+| 0d.    | Docker                           | https://github.com/subcoin-project/subcoin/blob/subcoin-milestone-3/Dockerfile The docker image is available at https://github.com/subcoin-project/subcoin/pkgs/container/subcoin/263310548?tag=v0.3.0  | |
+| 1.     | Article                          | https://liuchengxu.notion.site/Subcoin-A-Step-Toward-Decentralized-Fast-Sync-for-Bitcoin-68762427a4484d73906a91602d789be9 | |
+| 2.     | Fast Sync                        | https://github.com/subcoin-project/subcoin/blob/subcoin-milestone-3/docs/src/test_fast_sync.md |
+| 2.     | Bitcoin Transaction Broadcasting | RPC `subcoin_sendRawTransaction` is added, please refer to https://github.com/subcoin-project/subcoin/blob/subcoin-milestone-3/docs/src/test_bitcoin_transaction_broadcasting.md for the complete guide of `subcoin_sendRawTransaction` testing.  | |
+
+**Additional Information**
+
+- The article may be published on other platforms, such as Medium, after it has been proofread.