Add Smartsheet to the list of supported providers

src/OpenIddict.Client.WebIntegration/OpenIddictClientWebIntegrationProviders.xml

@@ -548,6 +548,25 @@
              Description="The value used as the 'team' parameter (allowing to bypass the login screen if the user is already authenticated in the specified workspace)" />
   </Provider>
 
+  <!--
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+  -->
+
+  <Provider Name="Smartsheet" Documentation="https://smartsheet.redoc.ly/#section/OAuth-Walkthrough">
+    <Environment Issuer="https://www.smartsheet.com/">
+      <Configuration AuthorizationEndpoint="https://app.smartsheet.com/b/authorize"
+                     TokenEndpoint="https://api.smartsheet.com/2.0/token"
+                     UserinfoEndpoint="https://api.smartsheet.com/2.0/users/me">
+        <GrantType Value="authorization_code" />
+        <GrantType Value="refresh_token" />
+      </Configuration>
+    </Environment>
+  </Provider>
+
   <!--
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