Create TODO.md

Author: gportay

TODO.md

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+# TODO
+
+- [X] Build and run an image on an [Heltec WiFi LoRa V2] board
+- [X] Implement out-of-tree samples
+  - [X] [send](samples/drivers/lora/send/)
+  - [X] [receive](samples/drivers/lora/receive/)
+- [X] Upstream [overlay](https://github.com/zephyrproject-rtos/zephyr/pull/51404)
+- [ ] Connect an [ST7735R] SPI TFT Display
+
+[Heltec WiFi LoRa V2]: https://cdn.shopify.com/s/files/1/1509/1638/files/NodeMCU_ESP32_mit_OLED_Display_433Mhz_LoRa_Pinout_Diagram.pdf?11943858538744564432
+[ST7735R]: https://www.az-delivery.de/en/products/1-77-zoll-spi-tft-display