Add requirements.txt and .gitignore

[prateekj117]

It's always better to have a requirements.txt file as it helps to make sure everyone is using the correct version of the dependency. It can otherwise lead to a massacre when a community is helping out with a project and can lead to a lot of confusion. It can lead to some people experiencing errors which are not actually related to project but because of different version of a dependency being used. It would also help with the easier setup of a virtual environment addressed in #2.

We should also add a .gitignore so that files that should not be committed don't get committed. For example .idea and .code files. I also see database.sqlite3 committed here which should not be done.

[mmlampinen]

Thanks! If you want to add some improvements, even if just placeholder for now, feel free to do so directly into the repos.