add README for docs install

docs/README.md

@@ -0,0 +1,22 @@
+# Mitmproxy Documentation
+
+This directory houses the mitmproxy documentation available at <https://docs.mitmproxy.org/>.
+
+## Quick Start
+
+ 1. Install [hugo](https://gohugo.io/).
+ 2. Windows users: Depending on your git settings, you may need to manually create a symlink from 
+ /docs/src/examples to /examples.
+
+
+Now you can run `hugo server -D` in ./src.
+
+
+## Extended Install
+
+This is required to modify CSS files.
+
+ 1. Install node, yarn, and [modd](https://github.com/cortesi/modd).
+ 2. Run `yarn` in this directory to get node-sass.
+
+You can now run `modd` in this directory instead of running hugo directly.