feat: add group functionality

[mrpmohiburrahman]

This PR partially addresses issue #747.

Implemented Changes

Added getGroups() function which returns an array of group objects, including identifier and name

Request for Feedback

I would appreciate feedback from the maintainers on whether I am heading in the right direction and if I should proceed with the implementation of other functions.

Planned Functions

Below are the additional functions I am considering implementing:

• getGroup(groupId) - Returns the group matching the provided groupId.
• contactsInGroup(groupId) - Retrieves all contacts within a specified group.
• addGroup(groupDetails) - Adds a new group.
• updateGroup(groupId, updatedDetails) - Updates an existing group's details.
• deleteGroup(groupId) - Deletes a group by groupId.
• addContactsToGroup(groupId, contactIds) - Adds contacts to a group.
• removeContactsFromGroup(groupId, contactIds) - Removes specified contacts from a group.

Question for Maintainers

Given the number of planned functions, would you prefer that I create separate PRs for each function, or include all of them in this PR?

closes #747

[morenoh149]

Thanks. Regarding your questions, lets put all those functions into one PR. Will you submit another PR or add the functions into this PR?

[mrpmohiburrahman]

Thanks. Regarding your questions, lets put all those functions into one PR. Will you submit another PR or add the functions into this PR?

I will add other functions into this pr. Give me a day.

[mrpmohiburrahman]

Thanks. Regarding your questions, lets put all those functions into one PR. Will you submit another PR or add the functions into this PR?

Hi, @morenoh149 ,

I have implemented all the required functions and updated the documentation in the README.md file.

Please review the changes at your convenience. Let me know if any further modifications are needed.

[morenoh149]

lgtm