C-Lightning command coverage added

docs/CLTCommandCoverage.md

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+### C-Lightning Commands Covered on RTL
+
+=== bitcoin ===
+- [x] feerates
+- [x] newaddr
+- [ ] txdiscard
+- [ ] txprepare
+- [ ] txsend
+- [x] withdraw
+
+=== channels ===
+- [x] close
+- [ ] fundchannel_cancel
+- [ ] fundchannel_complete
+- [ ] fundchannel_start
+- [x] getroute
+- [x] listchannels
+- [x] listforwards
+- [x] setchannelfee
+
+=== network ===
+- [x] connect
+- [x] disconnect
+- [x] listnodes
+- [x] listpeers
+- [ ] ping
+
+=== payment ===
+- [ ] createonion
+- [x] decodepay
+- [x] delexpiredinvoice
+- [ ] delinvoice
+- [x] invoice
+- [x] listinvoices
+- [x] listsendpays
+- [ ] listtransactions
+- [ ] sendonion
+- [ ] sendpay
+- [ ] waitanyinvoice
+- [ ] waitinvoice
+- [ ] waitsendpay
+
+=== plugin ===
+- [ ] autocleaninvoice
+- [ ] estimatefees
+- [x] fundchannel
+- [ ] getchaininfo
+- [ ] getrawblockbyheight
+- [ ] getutxout
+- [x] listpays
+- [x] pay
+- [ ] paystatus
+- [ ] plugin
+- [ ] sendrawtransaction
+
+=== utility ===
+- [ ] check
+- [x] checkmessage
+- [x] getinfo
+- [ ] getlog
+- [ ] getsharedsecret
+- [ ] help
+- [ ] listconfigs
+- [x] listfunds
+- [x] signmessage
+- [ ] stop
+- [ ] waitblockheight
+
+=== developer ===   
+- [ ] dev-listaddrs
+- [ ] dev-rescan-outputs