Add links to other documents from README.md
GOLOOP is blockchain node server.
-* [Build Guide](doc/build.md)
-* [Genesis Transaction](doc/genesis_tx.md)
-* [Genesis Storage](doc/genesis_storage.md)
-* [Tutorial](doc/tutorial.md)
+* General
+ - [Build Guide](doc/build.md)
+ - [Tutorial](doc/tutorial.md)
+* API Documents
+ - [JSON RPC v3](doc/jsonrpc_v3.md)
+ - [JSON RPC BTP Extension](doc/btp_extension.md)
+ - [GOLOOP Administration APIs](doc/goloop_admin_api.md)
+* Others
+ - [GOLOOP command line](doc/goloop_cli.md)
+ - [Genesis Transaction](doc/genesis_tx.md)
+ - [Genesis Storage](doc/genesis_storage.md)
