Add sample cpp code for CodeQL to flag

testcpp.cpp

@@ -0,0 +1,16 @@
+struct {
+	int s : 4; //wrong: behavior of bit-field members with implicit signage vary across compilers
+	unsigned int : 24; //correct: explicitly unsigned
+	signed int : 4; //correct: explicitly signed
+} bits;
+
+//Function foo's array parameter has a specified size
+void foo(int a[10]) {
+	int i = 0;
+	for (i = 0; i <10; i++) {
+		a[i] = i * 2;
+	}
+}
+
+int my_arr[5];
+foo(my_arr); //my_arr is smaller than foo's array parameter, and will cause access to memory outside its bounds