Create pull_request_template.md and Add Contribution Guidelines and License Section in README

[dimpal-yadav]

Describe your change:

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Add or change doctests? -- Note: Please avoid changing both code and tests in a single pull request.
• [ x] Documentation change?

Checklist:

• [ x] I have read CONTRIBUTING.md.
• [x ] This pull request is all my own work -- I have not plagiarized.
• [x ] I know that pull requests will not be merged if they fail the automated tests.
• [] This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• [] All new Python files are placed inside an existing directory.
• [] All filenames are in all lowercase characters with no spaces or dashes.
• [ ]All functions and variable names follow Python naming conventions.
• [] All function parameters and return values are annotated with Python type hints.
• [] All functions have doctests that pass the automated testing.
• [] All new algorithms include at least one URL that points to Wikipedia or another similar explanation.
• [x ] If this pull request resolves one or more open issues then the description above includes the issue number(s) with a closing keyword: "Fixes Add Pull Request (PR) Template #13031

[dimpal-yadav]

Describe your change:
Add an algorithm?
Fix a bug or typo in an existing algorithm?
Add or change doctests? -- Note: Please avoid changing both code and tests in a single pull request.
[ x] Documentation change?

Checklist:
[ x] I have read CONTRIBUTING.md.
[x ] This pull request is all my own work -- I have not plagiarized.
[x ] I know that pull requests will not be merged if they fail the automated tests.
[] This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
[] All new Python files are placed inside an existing directory.
[] All filenames are in all lowercase characters with no spaces or dashes.
[ ]All functions and variable names follow Python naming conventions.
[] All function parameters and return values are annotated with Python type hints.
[] All functions have doctests that pass the automated testing.
[] All new algorithms include at least one URL that points to Wikipedia or another similar explanation.
[x ] If this pull request resolves one or more open issues then the description above includes the issue number(s) with a closing keyword: "Fixes #13030

@dimpal-yadav
Update README.md

[cclauss]

https://github.com/TheAlgorithms/Python/blob/master/.github/pull_request_template.md already exists.
https://github.com/TheAlgorithms/Python/blob/master/CONTRIBUTING.md already exists.

The space in the filepath after /.github makes the first file invalid.

Please contribute to a different repo that does not care about attention to detail.