Add README

Author: maetthu

README.md

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+# dirhttps
+
+Spinning up an HTTPS server from current directory - the TLS equivalent of `python -m http.server`.
+
+## Install
+
+Use [prebuilt binaries](https://github.com/maetthu/dirhttps/releases)
+
+or build from source
+
+```
+go get -u github.com/maetthu/dirhttps
+$(go env GOPATH)/bin/dirhttps
+```
+
+## Setup
+
+_dirhttps_ needs a certificate and corresponding key to operate. Easiest option is to use the excellent [mkcert](https://github.com/FiloSottile/mkcert) tool which creates locally trusted, self-signed development certificates.
+
+* Install and setup mkcert CA
+* Create dirhttps certificate
+
+``` 
+$ mkdir ~/.config/dirhttps
+$ cd ~/.config/dirhttps
+$ mkcert -cert-file cert.pem -key-file key.pem localhost 127.0.0.1 more.hostnames.or.ips.if.needed.example.org
+```
+
+* Done
+
+## Usage
+
+```
+$ cd /tmp
+$ dirhttps  
+2019/03/31 13:40:26 Listening for HTTPS connections on :8443
+2019/03/31 13:40:26 Serving from directory /tmp
+```
+
+### Different listening address/port
+
+```
+$ dirhttps -l :1234
+$ dirhttps -l 127.0.0.2:8443
+```
+