Add README (#2)

README.md

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+godel-goland-plugin
+===================
+godel-goland-plugin is a gödel plugin that generates [Goland](https://www.jetbrains.com/go/) project files for a Go
+project.
+
+Plugin Tasks
+------------
+godel-goland-plugin provides the `goland` task, which generates GoLand project files (`.iml` and `.ipr` files) for the
+project. It assumes that a global Go SDK named "Go" has been defined. It also creates a file watchers task that applies
+the `./godelw format` on modified files on save. The `goland` task has a `clean` subcommand that removes all of the
+generated project files.