adding GetAppPublicKey

[leodotcloud]

No description provided.

[leodotcloud]

Can you please review @eggman64, @Donnie, @christophstrasen?

[eggman64]

Hey @leodotcloud thanks for your contribution.

Currently we have pretty good code coverage and we would be grateful if you added a small test to the new function that you have contributed.

I suggest you take a peek at the pem Verify method in the docs here.

Additionally, we add comments with the zendesk url like

go-zendesk/zendesk/org_membership.go

Line 8 in fddb564

// OrganizationMembership represents a Zendesk association between an org and a user.

Apologies for the missing Contribution guidelines. Will soon take care of that.

[eggman64]

Please add test case as well.

Thank you!

[eggman64]

Please add a description like so:

go-zendesk/zendesk/org_membership.go

Lines 21 to 23 in a2b158c

	// CreateOrganizationMembership creates an organization membership.
	//
	// Zendesk Core API docs: https://developer.zendesk.com/rest_api/docs/core/organization_memberships#create-membership