Added usage/install info for hexchat addons

Hexchat/README.md

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+## Hexchat Addons
+
+### Installation
+
+* Make sure Hexchat is installed with the Python 3 plugin
+* Install the [requests](http://docs.python-requests.org/en/master/) module
+* Copy the scripts to the 'addon' folder for Hexchat
+
+
+### Usage
+
+To use it, simply type `/teknik` which will bring up a file dialog prompt.  Select the file you want to upload, and then once it's done, the generated link will be put into the input box of hexchat.