update readme

README

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-1, Compy
-Compy is an HTTP/HTTPS proxy with mitm support and basic content compression/transcoding capabilities.
-
-2, Features:
-- HTTPS proxy (encrypted connection between client and proxy)
-- man in the middle support
-- gzip compression
-- transcode animated gif to static image
-- transcode jpeg to desired quality using libjpeg
-- transcode png
-- html/css/js minification
-
-3, Usage
-See compy --help
-
-4, Credits
-https://github.com/pixiv/go-libjpeg
-https://github.com/tdewolff/minify
-
-5, License
-See LICENSE

README.md

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+Compy
+=====
+
+Compy is an HTTP/HTTPS forward proxy with content compression/transcoding capabilities.  
+One use case is to reduce bandwidth usage when browsing on limited mobile broadband connection.
+
+
+Features:
+---------
+
+- HTTPS proxy (encrypted connection between client and proxy)
+- man in the middle support (compress HTTPS traffic)
+- HTTP2 support (over tls)
+- gzip compression
+- transcode animated gifs to static images
+- transcode jpeg images to desired quality using libjpeg
+- transcode png images
+- html/css/js minification
+
+
+Installation
+------------
+
+`go get github.com/barnacs/compy`
+
+### HTTPS
+To use the proxy over HTTPS, you will need a certificate for your host. If you don't already have one, you can get one for [free](https://letsencrypt.org/) or you can generate a self-signed cert by running:  
+`openssl req -x509 -newkey rsa:2048 -nodes -keyout cert.key -out cert.crt -days 3650 -subj '/CN=<your-domain>'`  
+then visit the proxy url and confirm that you trust your own certificate
+
+### MitM
+To enable man-in-the-middle support, you will need to generate a root cert to sign all the certs generated by the proxy on the fly:  
+`openssl req -x509 -newkey rsa:2048 -nodes -keyout ca.key -out ca.crt -days 3650 -subj '/CN=<your-domain>'`  
+and add it to your client (browser) as a trusted certificate authority
+
+
+Usage
+-----
+
+To run a simple http forward proxy:  
+`compy`
+
+To run it over tls:  
+`compy -cert cert.crt -key cert.key`
+
+With man in the middle support:  
+`compy -ca ca.crt -cakey ca.key`
+
+Probably the best option is to run it with both tls and mitm support, combining the two:  
+`compy -cert cert.crt -key cert.key -ca ca.crt -cakey ca.key`
+
+You can also specify the listen port (defaults to 9999):  
+`compy -host :9999``
+
+For compression, transcoding and minification options, see `compy --help`
+
+
+Credits
+-------
+
+https://github.com/pixiv/go-libjpeg
+https://github.com/tdewolff/minify
+
+
+License
+-------
+
+ISC, see LICENSE