add right script name, install and usage

README.md

@@ -1,3 +1,31 @@
 # prof-banana
 
-Convert decimal ciphers in base banana (https://git.lattuga.net/itec/banana) and back.
+Profanity plugin to convert decimal ciphers in base banana (https://git.lattuga.net/itec/banana) and back.
+
+===============================================================================
+CONTENTS                                                               *prof-banana*
+
+    1. Intro ................................................... |prof-banana-intro|
+    2. Requirements ..................................... |prof-banana-requirements|
+    3. Usage ................................................... |prof-banana-usage|
+    4. Licence ............................................... |prof-banana-licence|
+===============================================================================
+1. Intro                                                         *prof-banana-intro*
+
+Profanity Plugin to convert decimal to base banana and back.
+
+2. Requirements                                           *prof-banana-requirements*
+
+Nothing special
+
+3. Usage                                                         *prof-banana-usage*
+
+Installation:
+/plugins install prof-banana.py
+Usage:
+/banana enc 7467986
+/banana dec GESUCANE
+
+4. Licence                                                     *prof-banana-licence*
+
+Public Domain