Add integration tests readme

W4k.Extensions.Configuration.Aws.SecretsManager.IntegrationTests/README.md

@@ -0,0 +1,25 @@
+## W4k AWS Secrets Manager, Integration tests
+
+In order to run the integration tests, you need to have a valid AWS credentials set up on your machine.
+Integration tests require `w4ktest@admin` profile (see [`SecretsManagerTestFixture.cs`](./SecretsManagerTestFixture.cs)), it must be set up in your AWS credentials file (`~/.aws/credentials`).
+
+```ini
+[w4ktest]
+aws_access_key_id     = 00000000000000000000
+aws_secret_access_key = 0000000000000000000000000000000000000000
+aws_session_token     = ...
+account               = ...
+role                  = ...
+
+[w4ktest@admin]
+role_arn       = arn:aws:iam::000000000000:role/my-role@admin
+source_profile = w4ktest
+```
+
+Once credentials are set up, you can run the integration tests as any other tests in the solution.
+
+To run only unit tests (and skip integration tests), filter out tests by category:
+
+```bash
+dotnet test --filter "TestCategory!=Integration"
+```