Update and rename cmd to cmd.md

cmd → cmd.md

 ```
 aliyun组播禁止了，需要bootstrap/swarm connect
 
+go get github.com/Kubuxu/go-ipfs-swarm-key-gen/ipfs-swarm-key-gen
+ipfs-swarm-key-gen > ~/.ipfs/swarm.key
+ 
+ 
 ipfs bootstrap list
 ipfs bootstrap rm --all
 ipfs bootstrap add  /ip4/xxxxxxxxxx/tcp/4001/ipfs/QmabYFoBnCwUYHCx5wU75wtQ57YxqNdHRbLwpX8rVA2Bzo
@@ -8,4 +12,6 @@ ipfs bootstrap add  /ip4/xxxxxxxxxx/tcp/4001/ipfs/QmabYFoBnCwUYHCx5wU75wtQ57YxqN
 
 ipfs swarm peers
 ipfs swarm connect /ip4/xxxxxxxxxx/tcp/4001/ipfs/QmabYFoBnCwUYHCx5wU75wtQ57YxqNdHRbLwpX8rVA2Bzo
+
+ipfs daemon
 ```