adding checks for invalid and valid negative Integers

semantic/checkMinimumInteger.valid.java

+class checkMinimumIntegerInBrackets {
+
+	public static void main(String[] args) {
+							        
+		int a = -2147483648;
+	}
+}

semantic/checkMinimumIntegerInBrackets.invalid.mj

+class checkMinimumIntegerInBrackets {
+
+	public static void main(String[] args) {
+		        
+		int a = -(2147483648);
+	}
+}