Move 'snippet' queries to 'snippets' folders

cpp/ql/examples/snippets/throw_exception.ql

@@ -0,0 +1,14 @@
+/**
+ * @name Throw exception of type
+ * @description Finds places where we throw `parse_error` or one of its sub-types
+ * @tags base
+ *       class
+ *       throw
+ *       exception
+ */
+ 
+import cpp
+
+from ThrowExpr throw
+where throw.getType().(Class).getABaseClass*().getName() = "parse_error"
+select throw