Create Discharge assessment, added schedule time for stage 4

closes #8 (closed)

Tasks

• Create Discharge assessments UI
• Created discharge floating action button to appear only when child is normal & 24 hours have passed
• Create model class for discharge
• Create stage 5 discharge event
• added methods to validate , register stage 5
• added api request to mark enrollment as COMPLETED
• added method to queue api request when user is offline
• Created unit test for stage 5
• Created stage 4 variable schedule to store time

Discharge button	Discharge Assessment	Assessment Completed