Add README and start to work on build for prod guide

README.md

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 # SolarEnergy
-WIP project
+A project to optimize solar energy production and consumption. It connect to a current meter to decides whether some appliances controlled by relays shall be turned on or not, based on criterias such as:
+* Minimal uptime
+* Minimal downtime
+* Daily minimal runtime
+* Estimated consumption
+* Dependencies, conflicts
+
+## Components
+* [`central_backend`](./central_backend): The core component that connects all the other one and make the decisions to turn on or off devices
+* [`central_frontend`](./central_frontend): Web UI to configure the devices and monitor them
+* [`custom_consumtion`](./custom_consumption): Development tool used to test different production values
+* [`esp32_device`](./esp32_device/): The code installed in the MCU that controls relays (Wt32-Eth01 devices)
+* [`python_device`](./python_device/): An alternative to the esp32 to control relays. Not production ready.
+
+## Documentation
+* [Setup for development](./docs/SETUP_DEV.md) guide
+* [Setup for production](./docs/SETUP_PROD.md) guide

docs/SETUP_PROD.md

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+# Configure project for production
+
+## Create production build
+
+### Central
+The production release of central backend and frontend can be realised on a computer which has NodeJS and Rust installed by executing the following command at the root of the project:
+
+```bash
+make
+```
+
+The backend will be available at this location:
+
+```
+central_backend/target/release/central_backend
+```
+
+### Python device
+The Python device isn't production ready yet.
+
+
+### ESP32 device
+
+#### Flashing the device directly
+Use the following commands to flash a device (inside ESP-IDF environnment):
+
+```bash
+idf.py build
+idf.py flash
+```
+
+
+#### Getting an OTA update
+Use the following command to build an OTA update:
+
+```bash
+idf.py build
+```
+
+The OTA update is then located in `build/main.bin`
+
+
+## Pre-requisites
+* A server running a recent Linux (Debian / Ubuntu preferred) with `central` as hostname
+* DHCP configured on the network
+
+## Configure server
+TODO