[11-Installation_script_for_Stork] add .sh script for Stork installation

install.sh

+#!/bin/bash
+echo -n "Searching for Prometheus ..."
+if ! which prometheus > /dev/null; then
+   echo -e "\nPrometheus not found! Install? (y/n) \c"
+   read
+   if "$REPLY" = "y"; then
+      sudo apt-get install prometheus
+      echo "Prometheus has been already installed."
+   fi
+
+else
+    echo " yes."
+fi
+
+echo -n "Searching for Grafana ..."
+if ! which grafana-server > /dev/null; then
+   echo -e "\nGrafana not found! Install? (y/n) \c"
+   read
+   if "$REPLY" = "y"; then
+      sudo apt-get install grafana
+      echo "Grafana has been already installed."
+   fi
+else
+    echo " yes."
+fi
+
+echo -n "Searching for Kea-exporter ..."
+if ! which kea-exporter > /dev/null; then
+   echo -e "\nKea-exporter not found! Install? (y/n) \c"
+   read
+   if "$REPLY" = "y"; then
+      sudo pip3 install kea-exporter
+      echo "Kea-exporter has been already installed."
+   fi
+else
+    echo " yes."
+fi