Update README.md added 4 more Winter of Code program

[richard937]

If you are adding a SoC/WoC, please make sure

• [x] You have added the SoC/WoC in README.md file in correct table
• [x] You have added the SoC/WoC in index.html in correct table
• [x] ensure Website is tested on a deployment and looks okay

If you are fixing an issue please add

• [ ] fixes issue #issue_number to PR description

[deepanshu1422]

Please post your PR's on https://github.com/deepanshu1422/List-Of-Open-Source-Internships-Programs as this current repository is not merging any pull request since November 2019