Added contribution guideline link in README

[atarax665]

1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):

• N
• Y
  Fix Add Contributing.md #247

2. What is the scope of this PR (e.g. component or file name):

README.md

3. Provide a description of the PR(e.g. more details, effects, motivations or doc link):

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Other

4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):

• N
• Y

5. Are there test cases for these changes?(Y/N) select and add more details, references or doc links:

• Unit test
• Integration test
• Benchmark (add benchmark stats below)
• Manual test (add detailed scripts or steps below)
• Other

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[atarax665]

I have read the CLA Document and I hereby sign the CLA

[Peefy]

I have read the CLA Document and I hereby sign the CLA

Hello @atarax665, thank your for contribution! Pls sign the DCO.

[coveralls]

Pull Request Test Coverage Report for Build 7740141308

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 40.632%

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Totals
Change from base Build 7726301670:	0.0%
Covered Lines:	1594
Relevant Lines:	3923

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💛 - Coveralls

[zong-zhe]

Hi @atarax665 😊

Thanks for your contribution 👍. You can adjust your commit message using git commit --amend -s

More details - https://github.com/apps/dco

[zong-zhe]

Hi @atarax665 😄
Thanks for your contribution. You need to sign the DCO by git commit -s, signing this document not only protects your rights, but also ensures our cooperation is smoother and more transparent