Enhance the documentation for pairdrop-cli and add shell commands

pairdrop-cli/.pairdrop-cli-config.example

@@ -0,0 +1 @@
+DOMAIN=https://pairdrop.net/

pairdrop-cli/send-with-pairdrop

@@ -1,8 +1,5 @@
 #!/bin/bash
 
-# edit this to point to the pairdrop-cli executable
-pathToPairDropCli="/usr/local/bin/pairdrop-cli/pairdrop"
-
 # Initialize an array
 lines=()
 
@@ -17,4 +14,4 @@ length=${#lines[@]}
 # Remove the last entry
 unset 'lines[length-1]'
 
-$pathToPairDropCli "${lines[@]}"
+pairdrop "${lines[@]}"