add CONTRIBUTING.md

Change-Id: I239703f27b8cce72c44cd01798857c0cbec830fa

Author: rdementi

CONTRIBUTING.md

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+Contributing to Intel® Performance Counter Monitor (Intel® PCM)
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+
+Everyone is welcome to contribute. Patches may be submitted using GitHub pull requests (PRs).
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+License
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+(Intel® PCM) is licensed using a [BSD 3-clause license](https://github.com/intel/pcm/blob/master/LICENSE). All code submitted to the project is required to carry that license.
+
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+Coding Style
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+While we don't enforce stringent coding style requirements, we do encourage adherence to standard coding style practices, such as those outlined in the Google C++ Style Guide (https://google.github.io/styleguide/cppguide.html). When submitting patches, we request that you maintain the style consistency with the surrounding code. We discourage the use of tabs; please use 4 spaces for indentation instead.

LICENSE

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 BSD 3-Clause License
 
-Copyright (c) 2009-2023, Intel Corporation
+Copyright (c) 2009-2024, Intel Corporation
 Copyright (c) 2016-2020, opcm
 All rights reserved.
 

README.md

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 *Github repository statistics:* ![Custom badge](https://img.shields.io/endpoint?url=https%3A%2F%2Fhetthbszh0.execute-api.us-east-2.amazonaws.com%2Fdefault%2Fpcm-clones) ![Custom badge](https://img.shields.io/endpoint?url=https%3A%2F%2F5urjfrshcd.execute-api.us-east-2.amazonaws.com%2Fdefault%2Fpcm-yesterday-clones) ![Custom badge](https://img.shields.io/endpoint?url=https%3A%2F%2Fcsqqh18g3l.execute-api.us-east-2.amazonaws.com%2Fdefault%2Fpcm-today-clones)
 
+We welcome bug reports and enhancement requests, which can be submitted via the "Issues" section on GitHub. For those interested in contributing to the code, please refer to the guidelines outlined in the CONTRIBUTING.md file.
+
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