Update README.md file according to "README.md template"

Created MR for the issue according to Readme.md template format.
Please review.
Thanks

When trying to apply the patch, the following can be observed:

7.patch:18: trailing whitespace.
# Calendar Link
7.patch:63: trailing whitespace.
library as its foundation. Use composer to install the module
7.patch:73: trailing whitespace.
- Install with composer to ensure dependencies are also installed:
7.patch:79: trailing whitespace.
- Install as you would normally install a contributed Drupal module. For
7.patch:112: trailing whitespace.
Returns an array of links for all available calendar types. Each
warning: squelched 2 whitespace errors
warning: 7 lines add whitespace errors.

Hello Everyone !!
Created a #6 patch for calender link 3.0.x-dev. The patch successfully fix the old README.md according to README.md template.
Can someone please review the patch.

Thank you for your support!!!

Updated MR. Please review.

Reviewed MR!7, Patch is not cleanly applied.

a. In ##Use section, `calendar_link` given as twice with same marking as 1.
b.  Above ## Maintainers, Two lines prior are required.

Please review.

Reviewed MR!7,

a) 7.diff.txt:151: trailing whitespace.
In a twig template file, the following code with generate a link to the event
warning: 1 line adds whitespace errors.

b) Two line prior to maintainer section is required.

Reviewed the MR7 , added some minor update and rest of the changes looks Ok.
Moving to RTBC.
Thanks.

Still the issue exists:
1. Two line prior to "Maintainer" and "Configuration" section is required.

Reviewed MR!7, the file is updated as per the readme.md file template.
Hence marking it to RTBC.