Add a software requirements specification based on ieee srs template

[efitsiak]

This is a software Requirements Specification based on srs template from ieee. It contains a detailed description of the app's functions,. It could be really helpful to proggrammers and the app users.

Description

Please include a summary of the change and which issue is fixed. List any dependencies that are required for this change. If there are any UI change, please include the screenshots also.

Fixes #(issue)

Type of change

Just put an x in the [] which are valid.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

• [ ] ./gradlew assembleDebug assembleRelease
• [ ] ./gradlew checkstyle

Checklist:

• [ ] My code follows the style guidelines of this project
• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings

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[efitsiak]

Software Requirements Specification.pdf