Initialize docs and hello display

docs/project-overview.md

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+# Project Overview
+
+## Purpose
+
+This project will create a small standalone information display using an Arduino MKR1000. The device is meant to provide quick access to a few important data views on an SH1106 OLED screen with very simple physical controls.
+
+## User Interaction
+
+Two buttons are planned:
+
+- `Next`: move to the next available screen or option
+- `Select`: confirm an option or trigger a context-specific action
+
+The exact behavior can stay minimal at first. A practical initial version is:
+
+- `Next` cycles through screens
+- `Select` toggles a secondary mode when needed
+
+## Minimum Feature Scope
+
+The first usable version should include:
+
+- Time screen for local time
+- Weather forecast screen
+- Temperature screen using the AM2302
+- Humidity screen using the AM2302
+
+## Suggested Screen Behavior
+
+To keep the interface simple on a small display:
+
+- Show one primary screen at a time
+- Keep text large and readable
+- Refresh local sensor data regularly
+- Refresh network-based data less frequently than local sensor data
+- Avoid cluttered layouts
+
+## Data Sources
+
+### Local data
+
+- Temperature from AM2302
+- Humidity from AM2302
+
+### External data
+
+- Local time
+- Weather forecast
+
+The exact source and synchronization method for time and weather can be decided later during implementation.
+
+## Non-Goals For Now
+
+These are intentionally out of scope for the initial documentation phase:
+
+- Final UI layout details
+- Library selection
+- Network/API implementation
+- Pin-level firmware implementation
+- Power optimization
+
+## Open Items
+
+- Document exact wiring for the display, sensor, and buttons
+- Decide how local time will be synchronized
+- Decide where weather forecast data will come from
+- Define how button behavior should work on each screen
+- Confirm refresh intervals for sensor and network data