[daemon] Add readme including permissions scheme overview

daemon/README.md

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+# bxt Daemon
+
+This folder contains backend related code.
+
+# Permissions
+
+Permission entries consist of multiple nodes. Each node represent a category the user can access. Wildcards are supported.
+
+Following permission entries are supported:
+
+### sections:
+
+```yaml
+sections.{branch}.{repository}.{architecture}
+```
+
+### packages:
+
+_section-based permissions require corresponding section permissions as well_
+
+```yaml
+packages.get.{branch}.{repository}.{architecture}
+packages.snap.{branch}.{repository}.{architecture}
+packages.commit.{branch}.{repository}.{architecture}
+packages.compare.{branch}.{repository}.{architecture}
+packages.sync
+```
+
+### users:
+
+```yaml
+users.add
+users.remove
+users.get
+```
+
+### logs:
+
+```yaml
+logs
+```