add static validation script

scripts/validate.sh

+#!/bin/bash
+#
+# Validate syntax and keywords existance in each Robot file
+
+res=0
+for i in */*/*.robot ; do
+	[[ "$i" != *"Keywords.robot"* && "$i" != *"Keyword.robot"* ]] && \
+	(echo "++++ Dryrun $i" && \
+	robot --dryrun --output NONE --report NONE --log NONE $i || \
+	(echo "++++ Issues in file $i" && res=1));
+done
+
+exit $res