Adding CWE-798 MSSQL Tests

Author: felickz

java/ql/test/query-tests/security/CWE-798/semmle/tests/HardcodedMSSQLCredentials.java

@@ -0,0 +1,9 @@
+import com.microsoft.sqlserver.jdbc.SQLServerDataSource;
+
+public class HardcodedMSSQLCredentials {
+    public static void main(SQLServerDataSource ds) throws Exception {        
+        ds.setUser("Username"); // $ HardcodedCredentialsApiCall      
+        ds.setPassword("password"); // $ HardcodedCredentialsApiCall
+        ds.getConnection("Username", "password"); // $ HardcodedCredentialsApiCall
+      }
+}