Adding SPM Support

[afnanm1999]

Commit 1:

• Adding Package.swift for SPM Support.
• Adding .gitignore
• Fixing compiler warnings.
• Adding a bundle extension for a current variable. Which returns the bundle for SPM or CocoaPods.

Commit 2:

• Updating README.md to include SPM installation steps.

New Pull Request Checklist

• [x] I have read and understood the CONTRIBUTING guide

• [x] I have read the Documentation

• [x] I have searched for a similar pull request in the project and found none

• [x] I have updated this branch with the latest master to avoid conflicts (via merge from master or rebase)

• [x] I have added the required tests to prove the fix/feature I am adding

• [x] I have updated the documentation (if necessary)

• [x] I have run the tests and they pass

• [x] I have run the lint and it passes (pod lib lint)

This merge request fixes / reffers to the following issues: ...