docs: gitflow workflow simplified

README.md

@@ -181,7 +181,16 @@ A two-day workshop for bioinformaticians and molecular biologists with focus on
 
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-### Branching strategy - Gitflow
+## 2. Development & Collaboration
+
+### Branching model: Gitflow
+
+- start with two branches to record project history: `main` and `develop`
+- each new feature resides in its own branch (feature branch)
+- feature branch is generally created off latest `develop` commit
+- upon feature completion, feature branch is merged into `develop`
+
+![](img/gitflow01.png)
 
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