update git howto

Sensor-API.md

@@ -19,14 +19,25 @@ This wiki page is an attempt to document the Tasmota sensor API for sensor drive
 * Do not assume others will know immediately how to use your addition and know that you will need to write a Wiki for it in the end.
 
 # Managing a Forked Branch
-- git checkout Tasmota development branch
-- git pull upstream development
-  Now the local branch is synced to the Tasmota repo
-- git checkout -b <new_branch>
-- git push --set-upstream origin <new_branch>
+If you plan to submit a PR bigger than a simple change in one file, here is a short intro about how to do a clean PR.
+
+- fork the Tasmota repository in Github
+- `git clone https://github.com/<github_user>/Sonoff-Tasmota.git` and work on your local copy
+- `git remote add upstream https://github.com/arendst/Sonoff-Tasmota.git`
+- `git checkout development`
+- `git checkout -b <temp_branch>` to create a working branch where you can push commits
+- `git push --set-upstream origin <temp_branch>`
+- work on your local version and push as many commits as you want
+
+When you think it is ready to merge and submit a PR:
+- `git checkout development` to go back to the main branch
+- `git pull upstream development` to update all the latest changes
+- `git push` to update your fork
+- `git checkout -b <pr_branch>` to create a new branch for the final PR
+- `git push --set-upstream origin <pr_branch>`
 - Merge the edits but be sure to remove the history of your local commits
-- git merge --squash <your_initial_branch>
-- git commit -m "Message"
+- `git merge --squash <temp_branch>`
+- `git commit -m "Message"`
 
 Now you have a clean single commit from which you can create the PR on the Tasmota Github.