Add readline import for Posix operating systems to handle arrow keys.

software/script/chameleon_cli_main.py

@@ -8,7 +8,10 @@ import chameleon_com
 import chameleon_cmd
 import colorama
 import chameleon_cli_unit
-
+import os
+ 
+if os.name == 'posix':
+   import readline
 
 ULTRA = r"""
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