Added middleware for general security headers (#1700)

src/Api/Startup.cs

@@ -169,6 +169,9 @@ namespace Bit.Api
             IdentityModelEventSource.ShowPII = true;
             app.UseSerilog(env, appLifetime, globalSettings);
 
+            // Add general security headers
+            app.UseMiddleware<SecurityHeadersMiddleware>();
+
             // Default Middleware
             app.UseDefaultMiddleware(env, globalSettings);