anchor.diff:  
   ### echo service
   
  +this exmaple service endpoint echos back it's given payload.
  +
   ```
   node ./examples/dev-tools-echo-client.js
   ```
  
positive.code: 
  ### random number service
  
  ```
  node ./examples/dev-tools-random-client.js
  ```
  
  
  # type id service
  
  ```
  node ./examples/dev-tools-type-client.js
  
negative.code: 
  ### ping service
  
  This example service responds to a payload with contents 'ping' with a 'pong' message.
  
  ```
  node ./examples/dev-tools-ping-client.js
  