Added instructions and script for easy installation under Ubuntu

Tested with:

  * Ubuntu 16.04 LTS
  * Raspbian (Jesse, Pi 3 B+)

linux-install.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+# See the linux-install.md (README) first. 
+
+sudo apt update
+sudo apt install golang-1.10 git -y
+export PATH=$PATH:/usr/lib/go-1.10/bin
+cd /tmp
+git clone https://github.com/m13253/dns-over-https.git
+cd dns-over-https
+make && sudo make install
+
+
+