Feat: Add docs

docs/aribtrum.md

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+# Setup arbitrum bifrost and call
+
+This checklist describes how to bridge tokens
+
+## Bifrost between arbitrum related chains (eth, arbitrum, orbit)
+
+```bash
+bin/bifrost arbitrum \ 
+    --inbox $INBOX \
+    --l1-rpc $L1_RPC \
+    --l2-rpc $L2_RPC \
+    --to $TO \
+    --amount $AMOUNT \
+    --l2-calldata $L2_CALLDATA \ 
+    --keyfile $KEY \
+    --password $PASSWORD 
+```
+
+Output: Transaction Hash

docs/cctp.md

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+# Setup CCTP bifrost and call
+
+This checklist describes how to bridge tokens between any chain implementing CCTP
+
+## Bifrost between any chain implementing CCTP
+
+```bash
+bin/bifrost cctp \ 
+   --keyfile $WB_WALLET \
+   --rpc $ETH_SEPOLIA_RPC \
+   --recipient $RECIPIENT \
+   --amount $AMOUNT \
+   --token $TOKEN \
+   --contract $CONTRACT \
+   --domain $DOMAIN # 0 for ethereum, 3 for arbitrum
+```
+
+Output: Transaction Hash