add instructions to install on debian/ubuntu

README.md

@@ -140,6 +140,17 @@ https://github.com/dylanaraps/neofetch/wiki/Following-HEAD
 4. Install the package
     - `sudo prt-get depinst neofetch`
 
+### Debian / Ubuntu
+
+1. Add the 3rd party repo
+    - `echo "deb https://dl.bintray.com/dawidd6/neofetch jessie main" | sudo tee -a /etc/apt/sources.list`
+2. If you don't have curl, install it with this command
+    - `sudo apt-get install curl`
+3. Add public key and update your repos
+    - `curl -L https://bintray.com/user/downloadSubjectPublicKey?username=bintray -o Release-neofetch.key && sudo apt-key add Release-neofetch.key && rm Release-neofetch.key && sudo apt-get update`
+4. Install the package
+    - `sudo apt-get install neofetch`
+
 
 ### Others