Updated readme.md, added azure active directory configurations in the…

… formats example

README.md

@@ -571,12 +571,36 @@ Complete list of pool options can be found [here](https://github.com/vincit/tarn
 In addition to configuration object there is an option to pass config as a connection string. Connection strings are supported.
 
 ##### Classic Connection String
+###### Standard configuration using tedious driver
 
 ```
 Server=localhost,1433;Database=database;User Id=username;Password=password;Encrypt=true
+```
+###### Standard configuration using msnodesqlv8 driver
+```
 Driver=msnodesqlv8;Server=(local)\INSTANCE;Database=database;UID=DOMAIN\username;PWD=password;Encrypt=true
 ```
 
+##### Azure Active Directory Authentication Connection String
+
+Several types of Azure Authentication are supported:
+###### Authentication using Default Azure Credentials
+```
+Server=*.database.windows.net;Database=database;Authentication=azure-active-directory-default;ClientID=clientid;Encrypt=true
+```
+###### Authentication using Active Directory Password
+```
+Server=*.database.windows.net;Database=database;Authentication=azure-active-directory-password;User Id=username;Password=password;ClientID=clientid;TenantID=tenantid;Encrypt=true
+```
+###### Authentication using Access Token
+```
+Server=*.database.windows.net;Database=database;Authentication=azure-active-directory-access-token;Token=token;Encrypt=true
+```
+###### Authentication using Service Principal
+```
+Server=*.database.windows.net;Database=database;Authentication=azure-active-directory-service-principal-secret;ClientID=clientid;ClientSecret=clientsecret;TenantID=tenantid;Encrypt=true
+```
+
 ## Drivers
 
 ### Tedious
@@ -2097,4 +2121,4 @@ to create new connections or not
 [appveyor-url]: https://ci.appveyor.com/project/tediousjs/node-mssql
 
 [tedious-url]: https://www.npmjs.com/package/tedious
-[msnodesqlv8-url]: https://www.npmjs.com/package/msnodesqlv8
+[msnodesqlv8-url]: https://www.npmjs.com/package/msnodesqlv8