Edited README.md and CONTRIBUTING.md. Partially removed column width …

…limit in markdown files and inserted line breaks after each sentence. This will have a cleaner git history.

CONTRIBUTING.md

@@ -1,15 +1,25 @@
 # Contributing
 
-This project welcomes contributions and suggestions.  Most contributions require you to agree to a
-Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us
-the rights to use your contribution. For details, visit https://cla.opensource.microsoft.com.
+This project welcomes contributions and suggestions.
+Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution.
+For details, visit https://cla.opensource.microsoft.com.
 
-When you submit a pull request, a CLA bot will automatically determine whether you need to provide
-a CLA and decorate the PR appropriately (e.g., status check, comment). Simply follow the instructions
-provided by the bot. You will only need to do this once across all repos using our CLA.
+This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/).
+For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/).
+Contact [opencode@microsoft.com](mailto:opencode@microsoft.com) for any additional questions or comments.
 
-**IMPORTANT:** Pull requests must be submitted to the branch called *contrib*. Pull requests to any other branch will not be accepted.
+### Pull Requests
 
-This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/).
-For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or
-contact [opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional questions or comments.
+Submit pull requrests to **branch *contrib***.
+Pull requests to any other branch will not be accepted.
+
+When you submit a pull request, a CLA bot will automatically determine whether you need to **provide a CLA** and decorate the PR appropriately (e.g., status check, comment).
+Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.
+
+### Formatting
+
+Microsoft SEAL uses a customized `.clang-format` configuration for C++ code styling.
+A script `tools/scripts/clang-format-all.sh` is provided to easily format all C++ sources and headers in the `native` directory.
+
+Documentation are mostly written in GitHub-flavored Markdown.
+A line break is required after each full sentence.