Fixes #89: Converted fragments to activities

[dambadipudi]

Fixes #89 .

Changes done in this pull request:

Moved MainActivity to ui folder and ResourceListAdapter to adapter folder within ui folder

Deleted all the bottom navigation and fragments and created 2 simple activities as follows -

• Moved the sticky note creation from Home_Fragment into MainActivity
• Now clicking on the sticky note creates an explicit Intent to ResourcesListActivity (with resource topic as Intent Extra)
• The ResourcesListActivity sets the title to the Resource Topic

Currently mock data is still being displayed in both pages Sticky notes also still remain hard coded in the MainActivity.