Merge pull request ESCOMP#14 from huitang-earth/release-clm5.0.14-Nor

adding information about the branches in NorESMhub/CTSM repository

README.md

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+# Branches in NorESMhub/CTSM
+
+This repository has the following CTSM branches intended to facilitate working with NorESM2:
+
+- **master** - keep track with the master branch of [ESCOMP/CTSM](https://github.com/ESCOMP/CTSM).
+  - This branch is used by [NorESMhub/NorESM_LandSites_Platform](https://github.com/NorESMhub/NorESM_LandSites_Platform)
+  - This branch can be used for running the most recent version of [FATES](https://github.com/NGEET/fates)
+
+- **release-clm5.0.14-Nor** - The working branch used by NorESM2. Non-answer changing (with respect to NorESM2s CMIP6 version) pull requests should be sent to this branch. For other changes, new branches discuss with CTSM and NorESM core teams.
+  - Tags in this branch help identifying the link to the NorESM2 releases:
+    - release-clm5.0.14-Nor_v1.0.2 - the tag working with NorESM2 noresm2 tags: release-noresm2.0.4, release-noresm2.0.3
+    - release-clm5.0.14-Nor_v1.0.1 - the tag working with NorESM2 tags: release-noresm2.0.2 
+    - release-clm5.0.14-Nor_v1.0.0 - the tag working with NorESM2 tags: release-noresm2.0.1, release-noresm2.0.0 
+
+- **release-cesm2.2** - Copy of ESCOMP branch, base for release-cesm2.2.01-Nor branch.
+- **release-cesm2.2.01-Nor** - The branch used for the next phase of NorESM2 (under development).
+
+- If you have problems with using this repository, please use [issue](https://github.com/NorESMhub/CTSM/issues) to send your questions.