feat: added new patch to add email settings

[AhtishamShahid]

Added new patch to add email settings, this makes sure that NOTIFICATIONS_DEFAULT_FROM_EMAIL uses CONTACT_EMAIL if email value is not set

NOTIFICATIONS_DEFAULT_FROM_EMAIL = ENV_TOKENS.get("NOTIFICATIONS_DEFAULT_FROM_EMAIL", ENV_TOKENS["CONTACT_EMAIL"])

This resolves this issue
#27

FYI @bmtcril @saraburns1

[farhaanbukhsh]

@AhtishamShahid Thank you for this PR I think we should allow a way for people using tutor-contrib-notification to set the value for NOTIFICATIONS_DEFAULT_FROM_EMAIL, We need to add this in plugin.py and assign a default value to this.

And then use the value from here to set this in the file, also instead of setting it in two different places you can set it in openedx-common-settings and this should apply everywhere.

[AhtishamShahid]

@AhtishamShahid Thank you for this PR I think we should allow a way for people using tutor-contrib-notification to set the value for NOTIFICATIONS_DEFAULT_FROM_EMAIL, We need to add this in plugin.py and assign a default value to this.

And then use the value from here to set this in the file, also instead of setting it in two different places you can set it in openedx-common-settings and this should apply everywhere.

Hi , I have updated the PR and tested it with. tutor config save --set . Now users can update the email if needed.

[farhaanbukhsh]

👍

✅ I tested this: on tutor devstack, the changes are made in the config and settings files
✅ I read through the code
❌ I checked for accessibility issues
❌ Includes documentation

[farhaanbukhsh]

@AhtishamShahid A small nit is to add the same info in the readme file as well.