Add README

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

README.md

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+# interchan
+It's a 4chan clone!
+
+# Setup
+
+1. Create a `.env` file, and add a `SECRET_KEY=` value. Make sure the value is
+   20 characters long and random. Just mash on your keyboard and that should be
+   plenty secure.
+2. If you plan on using hCaptcha, add `HCAPTCHA_SITEKEY=` and `HCAPTCHA_SECRET=`
+   with your site key and secret.
+
+Everything else is standard Django setup. Make sure to check `threadchat/settings.py`.