Update landing page with instructions on how to enable in care

[shivankacker]

Refer to https://github.com/ohcnetwork/care_hello_fe

[Badal-sahoo]

Hi @shivankacker,

I would like to work on this issue.

I will refer to the care_hello_fe repository and update the landing page of care_abdm_fe to include clear instructions on how to enable this plugin in CARE.

Please let me know if this approach works.