Partial design doc for configuration handling

CONFIG_DESIGN.md

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+# Configuration Design
+
+This is just a little scratchpad / design document for figuring out how to deal
+with configuration.
+
+
+## Sources of Configuration
+
+1. Local config file `flamenco-manager.yaml`
+2. Environment variables (for easily putting into docker)
+3. CLI parameters
+
+
+## Flow of Configuration
+
+1. Load at startup from `flamenco-manager.yaml`
+    - Nice to have: monitoring & live reloading of that configuration file.
+2. Load at startup from environment variables
+    - Will never change.
+3. Load at startup from CLI parameters
+    - Will also never change
+4. Receive new config via API (for Lineup integration)
+    - Will require live adjustments of configuration.
+
+
+## Design Questions