Provide a README with examples of how to call each resource

For resetting password, POST a request to /jsonapi/user/password/reset with either a mail or name property in the body.

For user registration:

curl --location 'https://www.example.com/jsonapi/user/register' \
--header 'Content-Type: application/vnd.api+json' \
--header 'Accept: application/vnd.api+json' \
--data-raw '{
    "data": {
        "type": "user--user",
        "attributes": {
            "name": "test 123",
            "mail": "test@test123456.com",
            "pass": "test"
        }
        
    }
}'

And, if you want to change the email address or password for the user, you need to make a request like this. Current password is required for changing either mail or password.

curl --location --request PATCH 'https://www.example.com/jsonapi/user/user/1876ac28-5163-4ada-9ab7-481f60e6ed34' \
--header 'Content-Type: application/vnd.api+json' \
--header 'Accept: application/vnd.api+json' \
--header 'Authorization: Bearer [token]' \
--data-raw '{
    "data": {
        "type": "user--user",
        "id": "1876ac28-5163-4ada-9ab7-481f60e6ed34",
        "attributes": {
            "name": "test 1234",
            "mail": "test@example.com",
            "pass": { "existing": "test", "value": "test1" }
        }
    }
}'

Added to the project page.