docs: update README with docker.setup.script usage

acceptance/repository-cloudant/README.md

@@ -6,13 +6,6 @@ Acceptance tests for `@loopback/repository` + `loopback-connector-cloudant`.
 
 ### Using own Cloudant instance
 
-If you have a local Cloudant instance listening on `localhost` and the default
-port, with a `root` user and an empty password, use the following command:
-
-```bash
-npm test
-```
-
 If you have a local or remote Cloudant instance and would like to use that to
 run the test suite, use the following command:
 
@@ -25,6 +18,7 @@ CLOUDANT_URL=<URL> CLOUDANT_HOST=<HOST> CLOUDANT_PORT=<PORT> CLOUDANT_USER=<USER
 **Windows**
 
 ```bash
+SET CLOUDANT_URL=<URL>
 SET CLOUDANT_HOST=<HOST>
 SET CLOUDANT_PORT=<PORT>
 SET CLOUDANT_USER=<USER>
@@ -45,27 +39,25 @@ same (except couchDB doesn't support geosearch).
 
 - Install [Docker](https://docs.docker.com/engine/installation/).
 
-- Use the `couchDB3:latest` image, and rename the container as
-  `cloudant-testdb`.
-
-- Start the container, and create an admin and password for this image at
-  `http://localhost:{YOURPORT}/_utils/` if it doesn't have any yet.
-
-- Then run the following script
+- Run the following script
 
 ```bash
-source setup.sh <HOST> <PORT> <USER> <PASSWORD> <DATABASE>
+CLOUDANT_USER=<USER> CLOUDANT_PASSWORD=<PASSWORD> CLOUDANT_DATABASE=<DATABASE> node docker.setup.sh
 ```
 
-Where `<HOST>`, `<PORT>`, `<USER>`, `<PASSWORD>` and `<DATABASE>` are optional
-parameters. The default values are `localhost`, `8080`, `admin`, `pass` and
-`testdb` respectively.
+This script will create a couchDB3 container and also set the admin/password for
+you automatically.
+
+- The script `cloudant-config.sh` is generated by the above script. It has all
+  needed environment variables. Run the following command to test out your code
 
-- Run the test:
+```bash
+source cloudant-config.sh && npm test
+```
 
-  ```bash
-  npm test
-  ```
+Those environment variables need to be exported to run the test. Or you have to
+change them manually in `./src/__test__/cloudant.datasource.ts` file based on
+the response you get from running the script `docker.setup.sh`.
 
 ## Contributors