Install packages for linux

The script downloads the packages that are necessary for the sherlock.py. It is an automated procedure instead of the instructions in the README.md.
It contains some packages that are not in README but I couldn't run "pip3 install -r requirements.txt" without them.
It is for linux, I don't know if it works on something else.

I believe it is useful!

install_packages.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+# install python3 if not exist
+sudo apt-get install python3
+
+# install the all the necessery packages and requirements
+sudo apt-get install python3-pip
+sudo pip3 install --upgrade setuptools
+sudo pip3 install -r requirements.txt
+
+