feat(doc): add doc about debug

docs/_nav.md

@@ -18,6 +18,8 @@
     - [Configuration](bundle/configuration.md)
     - [Cache Warmup](bundle/cache-warmup.md)
     - [Expression Language](bundle/expression-language.md)
+    - [Api Platform](bundle/api-platform.md)
     - [Migrate existing application](bundle/migrate.md)
+    - [Debugging](bundle/debugging.md)
 - [Upgrading to 9.0](upgrading-9.0.md)
 - [Contributing](contributing.md)

docs/bundle/debugging.md

@@ -0,0 +1,25 @@
+# Debug a Mapper
+
+AutoMapper provides 2 ways to debug what's going on with a mapper when using the Symfony bundle:
+
+## The `debug:mapper` Command
+
+The `debug:mapper` command will display the mapping information for a specific mapper. 
+This can be useful to understand how AutoMapper is mapping your objects and why some properties are not mapped.
+
+```bash
+php bin/console debug:mapper User UserDTO
+```
+
+![Profiler](../images/debug-cli.png)
+
+## Using the symfony profiler
+
+AutoMapper provides a panel in the Symfony profiler that will display the mapping information for each request. 
+Please note that this only display Mapper that has been generated during the request, if you have a mapper that was not
+generated during the request it will not be displayed.
+
+You can find the panel in the Symfony profiler under the `AutoMapper` tab.
+
+![Profiler](../images/debug-profiler-1.png)
+![Profiler](../images/debug-profiler-2.png)

docs/bundle/index.md

@@ -7,4 +7,6 @@ features linked to Symfony way of doing things.
 - [Configuration](configuration.md)
 - [Cache Warmup](cache-warmup.md)
 - [Expression Language](expression-language.md)
+- [Api Platform](api-platform.md)
 - [Migrate existing application](migrate.md)
+- [Debugging](debugging.md)