Add release notes template

doc/release/release_template.txt

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+Announcement: scikit-image 0.X.0
+================================
+
+We're happy to announce the release of scikit-image v0.X.0!
+
+scikit-image is an image processing toolbox for SciPy that includes algorithms
+for segmentation, geometric transformations, color space manipulation,
+analysis, filtering, morphology, feature detection, and more.
+
+For more information, examples, and documentation, please visit our website:
+
+http://scikit-image.org
+
+
+New Features
+------------
+
+
+
+
+Improvements
+------------
+
+
+
+
+API Changes
+-----------
+
+
+
+
+Deprecations
+------------
+
+