Added readme for all packages

Author: noygal

client-api/README.md

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+# client-api
+
+## Task
+
+Create a client API package, the can run on both browser and node
+
+### Requirements
+
+1. The client should run on both browser and node - [AJAX/HTTP Library Comparison](http://andrewhfarmer.com/ajax-libraries/).
+2. export function ```search``` for searching the API
+```
+  // params example - { query: 'str-to-search' }
+  search(params) {
+    // return promise
+  }
+```
+3. export object ```config``` for configuring the API endpoint when not running on browser 
+```
+config = {
+  endpoint: '/api/' // default value
+}
+```

discovery/README.md

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+# Discovery
+
+This is a naive implementation of [service discovery](https://en.wikipedia.org/wiki/Service_discovery), 
+it is hard coded and has no actual discovering functionality.
+
+The purpose of this mode is educational, all configurations in micro services environments
+should be consume though external service.
+
+## Usage
+
+Read the code it short and simple.
+
+```
+const discovery = require('discovery')
+const serviceName = 'service-api'
+discovery[serviceName].host // service host
+discovery[serviceName].port // service port
+```

service-api/README.md

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+# service-api
+
+This is our micro service gateway, the only service exposed to the world.
+
+## Task
+
+Create a server with one GET endpoint at ```/api/search``` that receives one url parameter ```query```, 
+the return response should be the scraper result for this query.
+
+

service-scraper/README.md

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+# service-scraper
+
+## Task
+
+Create a server with one GET endpoint at ```/``` that receives one url parameter ```query```, 
+the return response should be the results of the search query on google play.
+
+### Requirements
+
+1. Don't waste time use [google-play-scraper](https://www.npmjs.com/package/google-play-scraper).
+2. Cache result (in memory is ok).
+3. return 404 when no query parameter or value.
+
+### Extra
+
+- Persistency of the cached results.
+- [Tape](https://github.com/substack/tape) tests.