Add documentation on how to migrate changes to platform

platform_migrate.md

@@ -0,0 +1,39 @@
+# Migrate code to Plaform
+
+### Cherry pick commits onto `platform-migrate` branch in 1.X chronograf
+
+```sh
+git checkout platform-migrate
+git cherry-pick <sha>
+```
+
+### Push those to origin in chrongoraf
+
+```sh
+git push origin platform-migrate 
+```
+
+### Cherry pick commit from `platform-migrate` branch onto branch in platform
+
+If this is the first time you are doing this you'll need to add chronograf as a remote
+platform.
+
+```sh
+git remote add chronograf [email protected]:influxdata/chronograf.git
+```
+
+If not, just fetch the remotely added chrongoraf.
+```sh
+git fetch chronograf
+```
+
+And then
+```sh
+git checkout -b cherry/<pick a name>
+git cherry-pick <sha from platform-migrate>
+git push origin cherry/<pick a name>
+```
+
+### Open PR.
+
+Use the github.