Expand readme to include sample config file

README.md

@@ -4,7 +4,7 @@ A custom component for esp-home to interface with IKEA's Frekvens Cube.
 
 ## Sources
 
-This repo is heavily based on the original [FrekvensPanel library by @frumperino][https://github.com/frumperino/FrekvensPanel].
+This repo is heavily based on the original [FrekvensPanel library by @frumperino](https://github.com/frumperino/FrekvensPanel).
 
 It's also inspired from the esphome component PCD8544.
 
@@ -15,5 +15,62 @@ Currently there is a dependency upon Adafruit GFX library. In your esphome confi
 - Declare necessary libraries
 - Define frekvenspanel component
 
+Here is a short config to demonstrate the usage to display time on panel:
+
+```yaml
+esphome:
+  name: frekvens8266-weather
+  platform: ESP8266
+  board: d1_mini
+  platformio_options:
+    upload_speed: 115200
+    lib_deps:
+      - me-no-dev/ESPAsyncTCP
+      - adafruit/Adafruit GFX Library   # Required for FrekvensPanel.
+      - Adafruit BusIO                  # Required by GFX Library.
+      - Wire                            # Also required by GFX.
+      - SPI                             # Also required by GFX.
+
+external_components:
+  - source:
+      type: local
+      path: <path of directory containing frekvens_panel>
+
+light:
+  - platform: monochromatic
+    name: 'Brightness'
+    output: matrix_brightness
+    restore_mode: RESTORE_DEFAULT_ON
+
+output:
+  - platform: esp8266_pwm
+    # Enables brightness control.
+    id: matrix_brightness
+    pin:
+      number: GPIO14
+      inverted: True
+
+time:
+  - platform: sntp
+    id: ntp_time
+    timezone: 'Europe/Paris'
+
+font:
+  - file: "04B03.ttf"
+    id: b03
+    size: 8
+
+display:
+  - platform: frekvens_panel
+    latch_pin: 12
+    clock_pin: 04
+    data_pin: 05
+
+    lambda: |-
+      auto time = id(ntp_time).now();
+      it.printf(0, 0, id(b03), "%d:%d", time.hour, time.minute);
+
+```
+
 ## License
 [TBD] the original library does not specify the license. This repo is consecutively not licensed yet either.