Update docs with the option to run in an embedded server

Author: jneira

README.md

@@ -3,7 +3,29 @@ Library to integrate [eta](http://eta-lang.org) [wai](https://github.com/yesodwe
 
 ## Getting Started
 * Visit the [Getting Started](http://eta-lang.org/docs/html/getting-started.html) eta instructions to build and install the library and the examples
-* In app/Main.hs you can find some examples of wai applications and how to generate a servlet class that can be deployed in your favorite servlet container
+* In [src/Network/Wai/Servlet/Examples.hs](https://github.com/jneira/wai-servlet/blob/master/src/Network/Wai/Servlet/Examples.hs) you can find some examples of wai applications and code to generate a servlet class that can be deployed in your favorite servlet container.
+* There are two options to deploy wai-servlet apps: generating a war file to be deployed in a servlet container or run it directly in a embedded one; this is the way more similar to use [wai warp](https://github.com/yesodweb/wai/tree/master/warp) for haskell wai applications.
+
+### Running an application in a embedded servlet container
+
+* You need to install and set the [wai-servlet-jetty-adapter](http://github/jneira/wai-servlet-jetty-adapter) package as a dependency. Currently is the unique adapter implemented for wai-servlet.
+* You have to import the module `Network.Wai.Servlet.Handler.Jetty` with the `run` function and call it with the port server and your application:
+```haskell
+{-# LANGUAGE OverloadedStrings #-}
+import Network.HTTP.Types                 (status200)
+import Network.Wai
+import Network.Wai.Servlet
+import Network.Wai.Servlet.Handler.Jetty
+
+appSimple :: Application
+appSimple _ respond = respond $
+   responseLBS status200 [("Content-Type", "text/plain")] "Hello World"
+
+main = run 3000 appSimple
+```
+
+### Generating a war to be deployed in a servlet container
+* This option supposes some manual steps. There is plans to make etlas build automatically a war file, tracked in [this issue](https://github.com/typelead/eta/issues/265).
 * The main function to generate the servlet is `Network.Wai.Servlet.makeServiceMethod` for example:
 ```haskell
 {-# LANGUAGE OverloadedStrings #-}
@@ -49,7 +71,7 @@ foreign export java "service" servSimple :: DefaultWaiServletApplication
 
 </web-app>
 ```
-* You have to place the jar or jars generated by epm in WEB-INF/lib and package the structure in a war file (using jar tool f.e.)
+* You have to place the jar or jars generated by etlas in WEB-INF/lib and package the structure in a war file (using jar tool f.e.)
 * With the war file you can deploy your wai application in a servlet container:
   * tomcat: https://tomcat.apache.org/tomcat-8.0-doc/deployer-howto.html
     * the easier way is to place the war file in $TOMCAT_INSTALL_DIR$/webapps