Add CI and test (#1)

Add CI and test

tests/test_add.py

@@ -0,0 +1,15 @@
+import unittest
+from common import *
+
+
+class BasicInstructionTest(unittest.TestCase):
+    def test_addi(self):
+        for val in [0, 1, 50, 256, 0x543210, 0xFFFFFFFF]:
+            program = instr_i(Opcode.ADDI, Register.A, val)
+            exit_code = exec_program(program)
+            self.assertIsNotNone(exit_code, "Connection timeout!")
+            self.assertEqual(exit_code, val & 0xFF, "Computed the wrong result!")
+
+
+if __name__ == '__main__':
+    unittest.main()