Fixing README links and app build instructions

See merge request !202

1. The app artifact link is not the latest build from the master repo
2. The clone URL still refers to GitHub

Updated "cordova-plugin-secure-storage" plugin to "cordova-plugin-secure-storage-echo"

See merge request !201

Improved UI of media Page, Added Metadata of media files

See merge request !200

Separated Sections for different different media files. ( Media Files Filtering Options)

See merge request !199

cordova-plugin-secure-storage is incompatible with Android 9.+ API 29

Added Thumbnail, duration of video, a button to open or download media files

Segregated all  media files in three categories i.e. PDF, Videos & Others

Since there is no need to sync the already downloaded media file with the dhis2 only by keeping the fact in mind that whenever we need to update a file we will remove old file and upload the new file on dhis2 by same name. In this way we can save a lot of users data wasting in everytime sync. Logic has been modified in this way. A bug is there in documents id has been fixed now.

Remove the embedded - Keeping baby warm video

Closes #193

See merge request !197

Added System to track app usage

See merge request !196

Added offline support ( using sqlite database & cordova file plugin )

See merge request !195

Merge branches 'app_usage' and 'offline-support' of https://gitlab.com/bhavesh3005sharma/mHBS-trainer into app_usage

Merge branch 'master' of https://gitlab.com/librehealth/incubating-projects/mhbs/mHBS-trainer into offline-support

 Conflicts:
	www/js/app.js

Added mediaPage and Populated with real data Fetched from bmgfdev instance & Added support to play all media files of type blob & Added Gitlab CI

See merge request !194

Merge branches 'mediaTab-data' and 'offline-support' of https://gitlab.com/bhavesh3005sharma/mHBS-trainer into offline-support