add shellscript helper to install external dependencies (non-python dependencies) listed on requirements.apt file

{{cookiecutter.repo_name}}/install_os_dependencies.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+if [[ $EUID -ne 0 ]]; then
+    echo -e "\nYou must run this with root privilege" 2>&1
+    echo -e "Please do:\n" 2>&1
+    echo "sudo ./${0##*/}" 2>&1
+    echo -e "\n" 2>&1
+
+    exit 1
+else
+
+    apt-get update
+
+    # Install the basic compilation dependencies and other required libraries of this project
+    cat requirements.apt | grep -v "#" | xargs sudo apt-get install -y
+
+    # cleaning downloaded packages from apt-get cache
+    apt-get clean
+
+fi