Add: events and conferences to the pack

[dilumdesilva]

Under this issue, anyone can add events and conferences that are open for students. In this category (event and conferences), we are trying to prioritise events which are affordable for students and events which are related to open-source contributions.

When you are adding an event, make sure you have completed the following steps and have them checked/marked in your PR body.

• [x] Creating a markdown/.md file with the event name in the events directory.
• [x] Adding further information related to the event or conference to the created markdown file.
• [x] Adding the event to the README of the events directory.
• [x] Linking the created event markdown/.md file with the event name to README.
• [x] Have less/clean commits.

When you are adding your contributions under this issue make sure you tag this issue in your PR. Furthermore, please refer to the contribution guidelines before you make any pull requests related to this issue.

Make one PR per event.