Add README

Author: jfacorro

README.md

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+# Example web application
+
+This is a very simple web application that shows how to set up a
+Clojerl project at this very early stages.
+
+It uses the `rebar3_clojerl` plugin to compile and to bring up a REPL.
+
+## Build
+
+    git clone https://github.com/clojerl/example-web-app
+    cd example-web-app
+    rebar3 clojerl compile
+
+To start the REPL just run:
+
+    rebar3 clojerl repl
+    ===> Verifying dependencies...
+    ===> Compiling web-app
+    Clojure 0.0.0-988.b107f25
+    clje.user=>
+
+Now we can start the `web-app` application:
+
+    clje.user=> (application/ensure_all_started.e :web-app)
+    #erl[:ok #erl(:ranch :cowlib :cowboy :web-app)]
+    clje.user=>
+
+You should see a `Hello World!` when browsing to
+`http://localhost:8080`.
+
+## Playing around in the REPL
+
+Changing the message shown is as easy as redefining the `message` var
+in the `web-app.root` namespace.
+
+    clje.user=> (ns web-app.root)
+    nil
+    clje.user=> (def message "Hello Nurse!")
+    #'web-app.root/message