update test readme

Author: dnth

tests/README.md

@@ -18,4 +18,31 @@ and run:
 
 ```
 pytest
-```
+```
+
+If all test passes, the output should look like the following:
+
+```shell
+========================================================================================== test session starts ===========================================================================================
+platform linux -- Python 3.10.13, pytest-7.4.2, pluggy-1.3.0
+rootdir: /media/dnth/Active-Projects/fastdup
+plugins: anyio-3.7.1, cov-4.1.0, mock-3.11.1
+collected 5 items                                                                                                                                                                                        
+
+tests/examples/test_datasets_example.py .                                                                                                                                                          [ 20%]
+tests/unit/test_datasets.py ....                                                                                                                                                                   [100%]
+
+============================================================================================ warnings summary ============================================================================================
+tests/examples/test_datasets_example.py::test_datasets_example
+  /home/dnth/anaconda3/envs/tests/lib/python3.10/site-packages/fastdup/fastdup_controller.py:385: UserWarning: No connected components found, try using a lower threshold
+    warnings.warn(f'No connected components found, try using a lower threshold')
+
+-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
+====================================================================================== 5 passed, 1 warning in 9.12s ======================================================================================
+```
+
+# Adding More Tests
+Include new tests in the approriate folders.
+
++ `unit/` - Put all unit tests here. 
++ `examples/` - Put all examples tests here.