Update README.md

README.md

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 REM-PX
 ======
 
-Allows easy conversion of rem to px and px to rem.
+A Sublime Text plugin that allows easy conversion of rem to px and px to rem.
+
+## Installation
+You can easily install the pluing through Will Bond's excellent Package Control (https://sublime.wbond.net/).
+If you want to install this plugin manually for some reason, simply clone this repo into your packages directory (make sure not to put it in the user sub dir).
+
+## Instructions
+
+### Converting px to rem
+1. Select a px value (e.g. '16px')
+2. Hit ctrl+shift+r by default (cmd+shift+r on Mac OS) to convert the value to rem. (Can also be done by selecting 'Convert highlighted px to rem' under the tools menu)
+
+### Converting rem to px
+1. Select a rem value (e.g. '1rem')
+2. Hit ctrl+shift+x by default (cmd+shift+x on Mac OS) to convert the value to px. (Can also be done by selecting 'Convert highlighted rem to px' under the tools menu)
+
+## Supported Features
+- Convert px values to rem
+- Convert rem values to px
+- Checks to make sure the value is a valid px unit to convert to rem and visa versa
+
+## Notes
+1. The default size of 1rem is 16px which can be changed in the user settings.
+2. All values will remove trailing zero's (e.g. '1.500rem' would become '1.5rem').
+
+## Examples (1rem = 16px)
+
+### Example 1 (rem to px)
+```css
+font-size: 1rem
+```
+
+Will convert to:
+```css
+font-size: 16px
+```
+
+### Example 2 (px to rem)
+
+```css
+font-size: 16px
+```
+
+Will convert to:
+```css
+font-size: 1rem
+```