Added README file for bashmarks plugin

plugins/bashmarks/README.md

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+# Bashmarks plugin
+
+The Bashmarks plugin allows you to create and use bookmarks for directories on your filesystems. 
+
+## Quickstart
+
+Create a new bookmark using the *bm -a* command:
+
+`$ bm -a mydir`
+
+The command above creates a bookmark for the current directory with the name *mydir*. 
+
+You can navigate to the location of a bookmark using the *bm -g* command: 
+
+`$ bm -g mydir`
+
+Tab completion is available when you need to enter a bookmark name in a command, such as when using *bm -g*
+
+Easily list all bookmarks you have setup using the *bm -l* command.  
+
+## Commands
+
+**bm -h** Print short help text
+
+**bm -a bookmarkname** Save the current directory as bookmarkname
+
+**bm -g bookmarkname** Go to the specified bookmark
+
+**bm -p bookmarkname** Print the bookmark 
+
+**bm -d bookmarkname** Delete a bookmark
+
+**bm -l** List all bookmarks
+
+## Valid bookmark names
+
+A bookmark name can contain lower and upper case characters (A-Z), numbers and underscore characters. No periods, semicolons, spaces or other characters are allowed in a bookmark name.