Add simpleMDE as md editor in submit note

[tushar5526]

Fixed #183

Check (put an 'x' between the square brackets) everything which applies:

• [x] I have added the issue number for which this pull request is created.

@Pavithratrdev @kgashok , please let me know about this update.

[tushar5526]

[tushar5526]

Also configured

• spell check
• autosave
• autofocus for editors

[tushar5526]

Raw markdown

Preview

[kgashok]

The editor is not usable on the Mobile. Please check @tushar5526

[tushar5526]

Noted @kgashok, I reproduced the bug and will raise a PR for it.

[tushar5526]

@kgashok I have made a new PR that will fix this issue.