New documentation. Resume, short example and intallation

README.md

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+# What is it?
+
+Kapow! is an adapter between the world of Pure UNIX® Shell and a HTTP service.
+It lies between these two worlds, making your life easier.
+
+Kapow! allows yo to publish a simple shell script as a REST HTTP service so you
+can delegate in others its execution as they don't need access to the host in
+which the command is ran.  Those repetitive tasks that everybody ask you to do
+because they require administrative access to some host can be published through
+a Kapow! server deployed in that host and the users who need the results can
+invoke it directly using a easy to use interfaz, a HTTP request.
+
+In the tradicional way you needed to create a project, manage its dependencies,
+code the server (probably including only a command execution) and deploy it
+somewhere.  And that's fine... until you find yourself again in the same
+situation with another awesome command.
+
+### From now on you can put Kapow! into action
+
+- Create a pow file containing an api call to Kapow! for creating the route
+that will publish your command, lets's call it `greet.pow`
+  ```sh
+    kapow route add /greet -c 'name=$(kapow get /request/params/name); echo Hello ${name:-World} | kapow set /response/body'
+  ```
+- Start the Kapow! server providing your pow file to configure the route
+  ```sh
+    kapow server greet.pow
+  ```
+- check that all it is working as intended using `curl`
+  ```sh
+    $ curl localhost:8080/greet
+    Hello World
+
+    $ curl localhost:8080/greet?name=friend
+    Hello friend
+  ```
+
+# Installing Kapow!
+
+Kapow! has a reference implementation in Go that is under active development right
+now.  If you want to start using Kapow! you can:
+* Download a binary (only linux is available , at this moment) from our
+[releases](https://github.com/BBVA/kapow/releases/latest) section
+* Install the package with Go's `get` command (you need the Go runtime installed
+and [configured](https://golang.org/cmd/go/))
+```sh
+go get -u github.com/BBVA/kapow
+```