Add 'doc/Banana.txt'

doc/Banana.txt

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+*Banana.txt* Vim Plugin to convert decimal to base banana and back.
+
+===============================================================================
+CONTENTS                                                               *Banana*
+
+    1. Intro ................................................... |Banana-intro|
+    2. Requirements ..................................... |Banana-requirements|
+    3. Usage ................................................... |Banana-usage|
+    4. Licence ............................................... |Banana-licence|
+===============================================================================
+1. Intro                                                         *Banana-intro*
+
+Vim Plugin to convert decimal to base banana and back.
+
+2. Requirements                                           *Banana-requirements*
+
+Vim compiled against python3
+
+3. Usage                                                         *Banana-usage*
+
+Select text in which you will find Banana/dec ciphers then <Leader>b/<Leader>a to convert them.
+
+4. Licence                                                     *Banana-licence*
+
+Public Domain