Merge pull request #15 from wharfr/meta_docs

Beginnings of a readme

README.md

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+# Introduction
+
+wharfrat is intended to make it easy and convenient to use a development
+environment in a docker container. The benefits of this are:
+
+ * **Simple:** A new development environment is setup with a single simple
+   command, meaning new team members are ready to go immediately.
+
+ * **Shared:** Everyone with access to the project (and docker) has access to
+   the development environment.
+
+ * **Controlled:** Everyone gets a development environment created from the same
+ image - no more "works for me" issues.
+
+ * **Versioned:** The configuration is version controlled, meaning you get the
+ development environment that matches the code branch you are working on.
+