#616 Calculate checksum of APK files to prevent corrupt downloads
#616 Calculate checksum of APK files to prevent corrupt downloads

- Added comment explaining buffer size

elimu-ai/webapp,literacyapp-org/literacyapp-web,literacyapp-org/literacyapp-web,elimu-ai/webapp,literacyapp-org/literacyapp-web,elimu-ai/webapp,literacyapp-org/literacyapp-web,elimu-ai/webapp