Add MMSeg citation (#825)

* fix typo

* add citation

CITATION.cff

@@ -0,0 +1,8 @@
+cff-version: 1.2.0
+message: "If you use this software, please cite it as below."
+authors:
+  - name: "MMSegmentation Contributors"
+title: "OpenMMLab Semantic Segmentation Toolbox and Benchmark"
+date-released: 2020-07-10
+url: "https://github.com/open-mmlab/mmsegmentation"
+license: Apache-2.0

setup.py

@@ -98,7 +98,7 @@ def parse_requirements(fname='requirements.txt', with_version=True):
     return packages
 
 
-def add_mim_extention():
+def add_mim_extension():
     """Add extra files that are required to support MIM into the package.
 
     These files will be added by creating a symlink to the originals if the
@@ -147,14 +147,14 @@ def add_mim_extention():
 
 
 if __name__ == '__main__':
-    add_mim_extention()
+    add_mim_extension()
     setup(
         name='mmsegmentation',
         version=get_version(),
         description='Open MMLab Semantic Segmentation Toolbox and Benchmark',
         long_description=readme(),
         long_description_content_type='text/markdown',
-        author='MMSegmentation Authors',
+        author='MMSegmentation Contributors',
         author_email='openmmlab@gmail.com',
         keywords='computer vision, semantic segmentation',
         url='http://github.com/open-mmlab/mmsegmentation',