pythongh-108494: Document howto add a project in PCbuild/readme.txt

PCbuild/readme.txt

@@ -293,3 +293,20 @@ project, with some projects overriding certain specific values. The GUI
 doesn't always reflect the correct settings and may confuse the user
 with false information, especially for settings that automatically adapt
 for different configurations.
+
+Add a new project
+-----------------
+
+For example, add ad new _testclinic_limited project to build a new
+_testclinic_limited extension, the file Modules/_testclinic_limited.c:
+
+* In PCbuild/, copy _asyncio.vcxproj to _testclinic_limited.vcxproj,
+  replace RootNamespace value with `_testclinic_limited`, replace
+  `_asyncio.c` with `_testclinic_limited.c`.
+* Open Visual Studio, open `PCbuild\pcbuild.sln`, add the
+  PCbuild\_testclinic_limited.vcxproj project to the solution ("add existing
+  project).
+* Add a dependency on the python project to the _testclinic_limited project.
+* Save and exit Visual Studio.
+* Add `;_testclinic_limited` to `<TestModules Include="...">` in
+  PCbuild\pcbuild.proj.