add README-en.md.

Signed-off-by: Theodore C <ccooperr@protonmail.com>
提供readme的英文版本（翻译）

README-en.md

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+# Mms application Information
+
+## Introduction
+
+The Mms application is a preset system application in OpenHarmony. The main functions include information viewing, sending SMS, receiving SMS, SMS delivery report, deleting SMS and other functions.
+
+### Architecture diagram
+
+![MMS_architectural_diagram](./doc/image/MMS_architectural_diagram.png)
+
+## Table of contents
+
+~~~
+/Mms/
+├── doc                                        # documentry
+├── entry
+│   └── src
+│       └── main
+│           └── ets                            
+│               └── default                    
+│                   ├── data                   # custom data type
+│                   ├── model                  
+│                   ├── pages                  
+│                       ├── conversation       
+│                       ├── conversationlist   
+│                       ├── index              
+│                       ├── info_msg           
+│                       ├── query_report       
+│                       └── settings           
+│                   ├── service                
+│                   ├── utils                 
+│                   ├── views                  
+│                   └── app.ets                # application life cycle
+│               └── ServiceAbility             # background resident service
+│           ├── resources                      
+│           └── config.json                    
+├── signs                                      
+└── LICENSE
+~~~
+
+## Related repos
+
+[**applications_contacts**](https://gitee.com/openharmony/applications_contacts)
+
+[**telephony_sms_mms**](https://gitee.com/openharmony/telephony_sms_mms)