feat: add common.sh file and initialize install.sh

install.sh

@@ -1 +1,13 @@
-#!/bin/bash
+#!/bin/bash
+
+source "./scripts/common.sh"
+
+if [[ $EUID -ne 0 ]]; then
+    echo "the script needs to be as root."
+    exit 1
+fi
+
+# if [ ! -d "$ENV_DIR" ]; then
+#     echo "$ENV_DIR is missing..., "
+#     mkdir -p $ENV_DIR
+# fi