added bash script to delete all build folders

delete_build_folder.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+# Written by Nishant Srivastava
+
+#  Call as
+#  ./delete_build_folder.sh
+
+# Install trash cli
+# brew install trash
+
+# Iterate over each child directory inside the current directory
+echo ""
+for dir in ./*;
+do
+	echo ""
+	echo ">>>> Deleting build directory inside " $dir
+	trash $dir/build/
+	echo ""
+	echo ">>>> Done."
+done