add README

README.md

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+# sxbm
+Simple Unix Bookmark Manager, a posix compliant shell script for managing your bookmarks.
+
+The script stores your bookmarks on a plain text file making it easily portable.
+
+## Installation and Usage
+Cone the repo.
+
+```
+git clone https://github.com/N-R-K/sxbm.git
+```
+
+Then just copy/move the script into your $PATH.
+Instead of copying, you can also create a symlink. This way you can do a git pull to get updates.
+
+Run `sxbm --help` to see usage.