Adding a shell script that checks if needed packages are installed on…

… server before app runs

run.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+if ! [ -x "$(command -v php)" ]; then
+  echo 'Error: PHP is not installed.' >&2
+  exit 1
+fi
+
+if ! [ -x "$(command -v node)" ]; then
+  echo 'Error: Node is not installed.' >&2
+  exit 1
+fi
+
+if ! [ -x "$(command -v python | command -v python3)" ]; then
+  echo 'Error: Python is not installed.' >&2
+  exit 1
+fi
+
+php ./index.php