added documentation of command stop

Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>

doc/index.rst

@@ -70,6 +70,7 @@ c-lightning Documentation
    lightning-setchannelfee <lightning-setchannelfee.7.md>
    lightning-signmessage <lightning-signmessage.7.md>
    lightning-signpsbt <lightning-signpsbt.7.md>
+   lightning-stop <lightning-stop.7.md>
    lightning-txdiscard <lightning-txdiscard.7.md>
    lightning-txprepare <lightning-txprepare.7.md>
    lightning-txsend <lightning-txsend.7.md>

doc/lightning-stop.7.md

@@ -0,0 +1,45 @@
+lightning-stop -- Command to shut off c-lightning node.
+============================================================
+
+SYNOPSIS
+--------
+
+**stop**
+
+DESCRIPTION
+-----------
+
+The **stop** is a RPC to shut off the c-lightning node.
+
+EXAMPLE JSON REQUEST
+------------
+```json
+{
+  "id": 82,
+  "method": "stop",
+  "params": {}
+}
+```
+
+RETURN VALUE
+------------
+
+On success, the command will return a emptu object.
+
+EXAMPLE JSON RESPONSE
+-----
+```json
+{}
+```
+
+
+AUTHOR
+------
+
+Vincenzo Palazzo <<vincenzo.palazzo@protonmail.com>> wrote the initial version of this man page, but many others did the hard work of actually implementing this rpc command.
+
+
+RESOURCES
+---------
+
+Main web site: <https://github.com/ElementsProject/lightning>