[#791] Add recommendation note for p4 ignoring intermediate files in …

…README

README.md

@@ -246,25 +246,39 @@ Before running TCR with Perforce, make sure that the P4 Client is properly confi
 To use TCR with Perforce, you'll need to add the `--vcs=p4` to the command line (you can also set this up in
 the `.tcr/config.yml`, see the [Configuration Directory](#configuration-directory) section below).
 
-> ***Note: IDE configuration when using TCR with Perforce***
->
-> In order to use TCR with Perforce, make sure to setup your IDE so that it
-> automatically marks files for edit on modify. Without this you will still be able to use TCR,
-> but you will have to repeatedly mark files for edit after every commit.
->
-> - With VS-Code, look for available Perforce extensions to enable it
-> - With JetBrains IDEs, [Perforce Helix Core](https://plugins.jetbrains.com/plugin/69-perforce-helix-core) plugin
-    allows to enable it
+##### Ignoring intermediate files
 
-> ***Note: Perforce limitations***
->
-> At the moment, TCR over Perforce is still in the experimentation phase. It does not yet support all the options
-> available with git.
-> Here are the main limitations:
->
-> - Option `--auto-push` or `-p` has no meaning with Perforce and is ignored
-> - Sub-command `log` is not supported
-> - Sub-command `stats` is not supported
+As TCR automatically submits everything that changed since last submit,
+you might end up with binary and/or build files in the depot.
+
+To prevent this from happening, you
+can [set up Perforce to ignore them](https://www.perforce.com/manuals/cmdref/Content/CmdRef/P4IGNORE.html).
+
+In practice, we found that you can use the same setting as with git:
+
+```shell
+p4 set P4IGNORE=.gitignore
+```
+
+##### IDE configuration when using TCR with Perforce
+
+In order to use TCR with Perforce, make sure to setup your IDE so that it
+automatically marks files for edit on modify. Without this you will still be able to use TCR,
+but you will have to repeatedly mark files for edit after every commit.
+
+- With VS-Code, look for available Perforce extensions to enable it
+- With JetBrains IDEs, [Perforce Helix Core](https://plugins.jetbrains.com/plugin/69-perforce-helix-core) plugin
+  allows to enable it
+
+##### Perforce limitations
+
+At the moment, TCR over Perforce is still in the experimentation phase. It does not yet support all the options
+available with git.
+Here are the main limitations:
+
+- Option `--auto-push` or `-p` has no meaning with Perforce and is ignored
+- Sub-command `log` is not supported
+- Sub-command `stats` is not supported
 
 </details>