initial commit (#782)

* initial commit

* pr feedback

Author: jennyf19

changelog.txt

@@ -1,3 +1,12 @@
+2.7.0
+=============
+- **MSAL integrates SourceLink https://github.com/dotnet/sourcelink.** This allows MSAL to embed pdb files and source code in the NuGet package, allowing users to debug into MSAL without replacing their package reference with a project reference. [MSAL PR](https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/pull/750)
+- **MSAL.NET now supports Xamarin.Mac**. We now ship another MSAL assembly, that can be used when building apps using Xamarin.Mac. MSAL.NET for Xamarin.Mac supports interactive authentication via an embedded browser, as well as silent authentication. It does not serialize its token cache to the keychain, instead users are asked to provide their own serialization mechanism as they see fit. A keychain based implementation will likely be implemented in a future release. [MSAL PR](https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/pull/756)
+- **Easier migration from ADALv2 to MSALv2 due to a new AcquireTokenFromRefreshToken API**. ADAL.NET v2.x exposes the refresh token in the `AuthenticationResult`, as well as methods to acquire a token from a refresh token in the `AuthenticationContext`. Through the `ConfidentialClientApplication`, MSAL now implements an explicit interface to help customers migrate from ADAL v2 to MSAL v2. With this method, developers can provide the previously used refresh token along with any scopes. The refresh token will be exchanged for a new one and cached. Please see https://aka.ms/msal-net-migration-adal2-msal2 for more details. [MSAL issue](https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/issues/690)
+- **Token cache account was not being deleted on Android platform**. [MSAL PR](https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/pull/754)
+- **When using ADAL v4.4.2 and MSAL v2.6 in the same Xamarin project, an error would result of `Cannot register two managed types` due to the iOS view controllers being registered under the same name**. Now the MSAL iOS view controllers are prefixed with `MSAL` so they are distinct from the ones in ADAL. [MSAL issue](https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/issues/776)
+- **When using the `KeychainSecurityGroup` property to enable application sharing of the token cache, developers were required to include the TeamId**. Now, MSAL resolves the TeamId at runtime. A new property `iOSKeychainSecurityGroup` should be used instead. See https://aka.ms/msal-net-ios-keychain-security-group for details. [MSAL issue](https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/issues/777)
+
 2.6.2
 =============
 Move AuthenticationContinuationHelper class back to the Microsoft.Identity.Client namespace to avoid breaking changes to existing apps.