chore: add some docs

docs/releng.md

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+# Branching concept
+
+- `master` is the default branch
+- releases `SHOULD` be triggered from `master` branch
+- release will trigger when tag is pushed on any branch
+- to create bugfix release, branch from `master` and create a tag
+- releases `SHOULD` not be created locally as they will conflict with pushing tagged branch
+
+## Contents
+
+Release contains:
+
+- Github
+- Docker
+- Cloudsmith

docs/status.md

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+# Charger status transition events
+
+From-To|A|B|C
+-|-|-|-
+None<br>(Startup)|disconnected|connected|connected<br>start charging
+A|-|connected|connected<br>start charging
+B|disconnected|-|start charging
+C|disconnected<br>stop charging|stop charging|-