quickfixing issue #662 to make CLI more userfriendly for inexperienced users (#663)

* making the cli more user friendly for inexperienced users #662

providing a quickfix for https://github.com/ElementsProject/lightning/issues/662

Basically I extended the ./lighting-cli --help message to at least state that one should use ./lighting-cli help, and added a hint to cli/lighting-cli help to the README

Closes: #662

README.md

@@ -57,6 +57,9 @@ You can start `lightningd` with the following command:
 lightningd/lightningd --network=testnet --log-level=debug
 ```
 
+### Listing all commands:
+`cli/lighting-cli help` will print a table of the API and lists the following commands
+
 ### Opening a channel on the Bitcoin testnet
 
 First you need to transfer some funds to `lightningd` so that it can open a channel:

cli/lightning-cli.c

@@ -67,7 +67,7 @@ int main(int argc, char *argv[])
 	configdir_register_opts(ctx, &lightning_dir, &rpc_filename);
 
 	opt_register_noarg("--help|-h", opt_usage_and_exit,
-			   "<command> [<params>...]", "Show this message");
+			   "<command> [<params>...]", "Show this message\t use the command help (without hyphen) to get a list of all commands");
 	opt_register_version();
 
 	opt_early_parse(argc, argv, opt_log_stderr_exit);