Add Google Colab

Author: wannaphong

README.md

@@ -1,4 +1,6 @@
 # TTG : Thai Text Generator
+[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/drive/1X6D8J0sWNi8UgJi7Hk5YL4FqepZ7laxS?usp=sharing]
+
 Thai Text Generator
 
 ## Install
@@ -94,4 +96,4 @@ en_sentence(N:int=4,prob:float=0.001, start_seq:str=None, output_str:bool = True
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
-```
+```