Initial commit: Simple Sensor firmware for Heltec T114 with BME280

- MeshCore-based Simple Sensor firmware
- Heltec T114 without display
- BME280 sensor support (temp/humidity/pressure)
- Radio: 868.856018 MHz, SF7, BW62.5 kHz, CR4/7
- 2-byte path hash
- PlatformIO project

variants/mesh_pocket/MeshPocket.cpp

@@ -0,0 +1,12 @@
+#include <Arduino.h>
+#include <Wire.h>
+
+#include "MeshPocket.h"
+
+void HeltecMeshPocket::begin() {
+  NRF52Board::begin();
+  Serial.begin(115200);
+  pinMode(PIN_VBAT_READ, INPUT);
+
+  pinMode(PIN_USER_BTN, INPUT);
+}