Added text document for domain claiming

src/Core/MailTemplates/Handlebars/AdminConsole/DomainClaimedByOrganization.text.hbs

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+As a member of {{OrganizationName}}, your Bitwarden account is claimed and owned by your organization.
+
+Here's what that means:
+- This account should only be used to store items related to {{OrganizationName}}
+- Your admins managing your Bitwarden organization manages your email address and other account settings
+- Your admins can also revoke or delete your account at any time
+
+For more information, please refer to the following help article: Claimed Accounts (https://bitwarden.com/help/claimed-accounts)