Add missing release notes documentation file

doc/release_notes.rst

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+====================
+Release notes
+====================
+
+.. toctree::
+   :maxdepth: 2
+
+1.1.0
+=====
+
+https://github.com/INM-6/h5py_wrapper/releases/tag/1.1.0
+
+This release adds Python3 support to the wrapper. This transition required major changes to the code base, particularly the handling of strings in the wrapper was revised.
+
+Furthermore, we added:
+
+- support for complex numbers
+- support for numpy 64bit data types.
+- improved the error handling and warnings.
+
+This release contains 48 commits, 11 closed issues and 18 merged pull-requests.
+
+API changes
++++++++++++
+
+The deprecated functions `add_to_h5` and `load_h5` were removed.
+
+Contributors
+++++++++++++
+
+Maximilian Schmidt
+Jakob Jordan
+Julia Sprenger
+
+1.0.1
+=====
+
+https://github.com/INM-6/h5py_wrapper/releases/tag/1.0.1
+
+API changes
++++++++++++
+
+The old function names `load_h5` and `add_to_h5` have been replaced by load and save.
+The old function names are still available, but will raise a DeprecationWarning and be removed in one of the next releases.
+New features and functionality
+
+The wrapper now explicitly stores the types of values of the dictionary in the hdf5 file and is able to retrieve the original value types. A list of supported value types is provided in the documentation.
+
+This has the effect that old files created with release version 0.0.1 cannot be loaded with 1.0.1. To remedy this, we provide a conversion script that converts old files to the new format. The user can provide
+
+    - single file names,
+    - lists of file names
+    - files containing file names
+    - input from stdin.
+
+Contributors
+++++++++++++
+
+Maximilian Schmidt
+Jakob Jordan
+
+v0.0.1
+======
+
+https://github.com/INM-6/h5py_wrapper/releases/tag/v0.0.1
+
+This release contains 16 commits since the migration to github.
+The wrapper provides the two basic functions `wrapper.add_to_h5` and `wrapper.load_h5`.
+Furthermore, the user can load h5 files (load_h5_old) that were created with a deprecated version of the wrapper and transform these files into the current format (transform_h5).
+
+
+Contributors
+++++++++++++
+
+(in alphabetical order)
+
+Hannah Bos
+Michael Denker
+Jakob Jordan
+Maximilian Schmidt
+Jannis Schuecker