Improves README

servers/execution/runner/README.md

@@ -1,8 +1,19 @@
 # :runner: Digital Twin Runner
 
-A commandline utility to run a digital twin. It will provide REST interface
-to execute lifecycle scripts of a digital twin. It is possible to run
-multiple instances of this utility within one computer.
+A utility service to manage the [lifecycle of one digital twin](../../../docs/user/digital-twins/lifecycle.md).
+The lifecycle of a digital twin is made of multiple phases. This digital twin runner utility
+helps with the managing the execution of lifecycle phases. This utility can be
+launched in two scenarios:
+
+1. User launches this from commandline and let the utility
+manage the lifecycle of one digital twin.
+2. Execution infrastructure of Digital Twin as a Service (DTaaS)
+launches this utility and instructs it to manage the lifecycle of
+one digital twin.
+
+The digital twin runner utility runs as a service and will provide
+REST API interface to execute lifecycle scripts of a digital twin.
+One digital twin runner is responsible for execution of a digital twin.
 
 ## :hammer_and_wrench: Developer Commands
 
@@ -11,6 +22,7 @@ yarn install    # Install dependencies for the microservice
 yarn syntax     # analyzes source code for potential errors, style violations, and other issues,
 yarn build      # compile ES6 files into ES5 javascript files and copy all JS files into build/ directory
 yarn test       # run tests
+yarn test:nocov  # run the tests but do not report coverage
 yarn test:watchAll  #Watch changes in test/ and run the tests
 yarn start      # start the application
 yarn clean      # deletes directories "build", "coverage", and "dist"
@@ -68,6 +80,30 @@ sudo npm list -g # should list @dtaas/runner in the packages
 sudo npm remove --global @dtaas/runner 
 ```
 
+## :rocket: Access the service
+
+```bash
+sudo npm install  --registry http://localhost:4873 -g @dtaas/runner
+runner # launch the digital twin runner
+```
+
+Once launched, the utility runs at `port 3000`.
+
+If launched on one computer,
+you can access the same at `http://localhost:3000`.
+
+Access to the service on network is available at `http://<ip or hostname>:3000/`.
+
+Two REST API routes are active. The route paths and the responses given
+for these two sources are:
+
+| REST API Route | Return Value | Comment |
+|:---|:---|:---|
+| localhost:3000/phase | [ hello ] | The array get appended with each invocation. All the elements of are _array_. |
+| localhost:3000/lifecycle/phase | _true_ | Always returns _true_ |
+|||
+
+
 ## :balance_scale: License
 
 This software is owned by