README.md in mailersend-ruby-1.5.2 vs README.md in mailersend-ruby-1.6.0

@@ -35,21 +35,25 @@
     - [Update an inbound route](#update-an-inbound-route)
     - [Delete an inbound route](#delete-an-inbound-route)
   - [Domains](#domains)
     - [Get a list of domains](#get-a-list-of-domains)
     - [Get a single domain](#get-a-single-domain)
+    - [Add a domain](#add-a-domain)
     - [Delete a domain](#delete-a-domain)
     - [Get recipients for a domain](#get-recipients-for-a-domain)
     - [Update domain settings](#update-domain-settings)
     - [Get DNS Records](#get-dns-records)
     - [Get verification status](#get-verification-status)
   - [Sender Identities](#sender-identities)
     - [Get a list of sender identities](#get-a-list-of-sender-identities)
     - [Get a single sender identity](#get-a-single-sender-identity)
+    - [Get a single sender identity by email](#get-a-single-sender-identity-by-email)
     - [Add a sender identity](#add-a-sender-identity)
     - [Update a sender identity](#update-a-sender-identity)
+    - [Update a sender identity by email](#update-a-sender-identity-by-email)
     - [Delete a sender identity](#delete-a-sender-identity)
+    - [Delete a sender identity by email](#delete-a-sender-identity-by-email)
   - [Messages](#messages)
     - [Get a list of messages](#get-a-list-of-messages)
     - [Get info for a single message](#get-info-for-a-single-message)
   - [Scheduled Messages](#scheduled-messages)
     - [Get a list of scheduled messages](#get-a-list-of-scheduled-messages)
@@ -463,10 +467,19 @@
 
 ms_domains = Mailersend::Domains.new
 ms_domains.single(domain_id: "idofdomain12412")
 ```
 
+### Add a domain
+
+```ruby
+require "mailersend-ruby"
+
+ms_domains = Mailersend::Domains.new
+ms_domains.add(name: 'yourdomain')
+```
+
 ### Delete a domain
 
 ```ruby
 require "mailersend-ruby"
 
@@ -528,10 +541,19 @@
 
 ms_sender_identity = Mailersend::SenderIdentity.new
 ms_sender_identity.single(identity_id: 'idofidentity123')
 ```
 
+### Get a single sender identity by email
+
+```ruby
+require "mailersend-ruby"
+
+ms_sender_identity = Mailersend::SenderIdentity.new
+ms_sender_identity.single_by_email(email: '[e-mail]')
+```
+
 ### Add a sender identity
 
 ```ruby
 require "mailersend-ruby"
 
@@ -546,16 +568,34 @@
 
 ms_sender_identity = Mailersend::SenderIdentity.new
 ms_sender_identity.update(identity_id: 'idofidentity123', reply_to_email: 'replyemail', reply_to_name: 'replyname')
 ```
 
+### Update a sender identity by email
+
+```ruby
+require "mailersend-ruby"
+
+ms_sender_identity = Mailersend::SenderIdentity.new
+ms_sender_identity.update_by_email(email: '[e-mail]', reply_to_email: 'replyemail', reply_to_name: 'replyname')
+```
+
 ### Delete a sender identity
 
 ```ruby
 require "mailersend-ruby"
 
 ms_sender_identity = Mailersend::SenderIdentity.new
 ms_sender_identity.delete(identity_id: 'idofidentity123')
+```
+
+### Delete a sender identity by email
+
+```ruby
+require "mailersend-ruby"
+
+ms_sender_identity = Mailersend::SenderIdentity.new
+ms_sender_identity.delete_by_email(email: '[e-mail]')
 ```
 
 ## Messages
 
 ### Get a list of messages