Fisrt version of readme for GitHub (#10931)

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+Cloning the project repositories
+======
+
+Vaadin 7 consists of three separate repositories
+* https://github.com/vaadin/vaadin.git
+* https://github.com/vaadin/gwt.git
+* https://github.com/vaadin/gwt-tools.git
+
+Start by cloning these repositories into the same folder:
+<pre><code>git clone https://github.com/vaadin/vaadin.git
+git clone https://github.com/vaadin/gwt.git
+git clone https://github.com/vaadin/gwt-tools.git</code></pre>
+
+The *vaadin* and *gwt* repositories contain project code. The *gwt-tools* project only contain dependency jars used by the other projects.
+
+Do not rename the repositories as the rest of this document relies on using the standard naming.
+
+Setting up Eclipse to Develop Vaadin 7
+=========
+Assuming you have cloned the repositories as described in “Cloning the project repositories” above, you can import the *vaadin* and *gwt* projects into Eclipse as follows:
+
+Start Eclipse
+-------------
+Start Eclipse and use the root checkout folder (the one containing the *vaadin*, *gwt* and *gwt-tools* folders) as the workspace folder
+
+Define Required Variables for the GWT Eclipse Projects
+--------
+To be able to find all files, the GWT project requires you to define a couple of variables:
+
+1. Open *Window* -> *Preferences* (Windows) or *Eclipse* -> *Preferences* (Mac)
+1. Go to *General* ->  *Workspace* -> *Linked Resources*
+1. Add a new Path Variable **GWT_ROOT** referring to the gwt folder containing the gwt project
+![GWT_ROOT](http://f.cl.ly/items/430q0H0z3t362Z1A1n3L/LinkedResources.png "Defining GWT_ROOT")
+1. Go to *Java* -> *Build Path* -> *Classpath Variables*
+1. Add two new variables
+  1. GWT_TOOLS referring to the gwt-tools folder containing the dependency jars
+  1. JDK_HOME referring to your jdk installation directory 
+     ![GWT_TOOLS](http://f.cl.ly/items/1k2Z1n2v0p0y3l0X0D1G/ClasspathVars.png "Defining GWT_TOOLS")
+1. Go to Java -> Compiler
+  1. Check that the compliance level has been set to 1.6 (or higher)
+
+Import the Projects into the Workspace
+------------
+1. Do *File* -> *Import* -> *General* -> *Existing Projects into Workspace*
+![ImportProject](http://f.cl.ly/items/0G361519182v1z2T1o1O/Import.png "Import project")
+1. Select the workspace folder as root directory
+1. Click “deselect all” and select
+  1. gwt-dev
+  2. gwt-user
+  3. vaadin
+1. Click “finish” to complete the import
+
+![FinishImportProject](http://cl.ly/image/2W3S0P2c2p1t/Import2.png "Finishing Project Import")
+
+You should now have three projects in your workspace and they should all compile without errors (there might be warnings).
+
+Note that the first compilation takes a while to finish as Ivy downloads dependencies used in the projects.
+
+Compiling the Default Widget Set and Themes
+--------
+Compile the default widget set by executing the default target in build/ide.xml in the vaadin project. 
+In Eclipse this is done by opening build/ide.xml, right clicking on it and choosing *Run As* -> *Ant Build*.
+![CompileWidgetSet](http://cl.ly/image/1R43162b282e/build.png "Compiling the Widget Set")
+
+Running a UI test
+------
+The *vaadin* project includes an embedded Jetty which is used for running the UI tests. 
+It is a standard Java application: *com.vaadin.launcher.DevelopmentServerLauncher*. 
+Launch it in debug mode in Eclipse by right clicking on it and selecting *Debug As* -> *Java Application*.
+
+This launches a Jetty on port 8888 which allows you to run any UI class in the project by opening http://localhost:8888/run/&lt;UI class name&gt;?restartApplication in your browser, e.g. [http://localhost:8888/run/com.vaadin.tests.components.label.LabelModes?restartApplication](http://localhost:8888/run/com.vaadin.tests.components.label.LabelModes?restartApplication) (Add ?restartApplication to ensure).
+
+Running JUnit tests
+=====
+The JUnit tests for the projects can be run using
+<pre><code>ant test</code></pre>
+
+Running this in the *gwt* directory will run the GWT JUnit tests.
+Running it in the *vaadin* directory will run the Vaadin JUnit tests.
+
+Running the Vaadin TestBench tests currently requires access to a correctly configured TestBench 2 cluster, only available inside Vaadin.
+
+Building a package
+=====
+The distribution files can be built in a few steps. First build the *gwt* project by running 
+<pre><code>ant</code></pre>
+in the *gwt* directory. The elemental package needs to be built separately:
+<pre><code>ant elemental</code></pre>
+Building the elemental package is not possible on Windows as it requires gcc.
+
+Move to the *vaadin* project directory and unpack the previously built gwt jars
+<pre><code>ant -f gwt-files.xml unpack.gwt</code></pre>
+Then build the *vaadin* project by running
+<pre><code>ant</code></pre>
+in the *vaadin* directory.
+