Add a RELEASE.md file.

RELEASE.md

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+Release type: minor
+
+`strawberry codegen` can now operate on multiple input query files.
+The previous behavior of naming the file `types.js` and `types.py`
+for the builtin `typescript` and `python` plugins respectively is
+preserved, but only if a single query file is passed.  When more
+than one query file is passed, the code generator will now use
+the stem of the query file's name to construct the name of the
+output files.  e.g. `my_query.graphql` -> `my_query.js` or
+`my_query.py`.  Creators of custom plugins are responsible
+for controlling the name of the output file themselves.  To
+accomodate this, if the `__init__` method of a `QueryCodegenPlugin`
+has a parameter named `query` or `query_file`, the `pathlib.Path`
+to the query file will be passed to the plugin's `__init__`
+method.
+
+Finally, the `ConsolePlugin` has also recieved two new lifecycle
+methods.  Unlike other `QueryCodegenPlugin`, the same instance of
+the `ConsolePlugin` is used for each query file processed.  This
+allows it to keep state around how many total files were processed.
+The `ConsolePlugin` recieved two new lifecycle hooks: `before_any_start`
+and `after_all_finished` that get called at the appropriate times.