Add BME280 example device

devices/example-bme280/Impl.cpp

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+#include "../features/BME280.h"
+#include "Device.h"
+
+
+constexpr const char BME280_NAME[] = "bme280";
+const uint8_t BME280_I2C_ADDR = 0x76;
+
+class Bme280Device : public Device {
+public:
+    Bme280Device() :
+            bme280(this)
+    {
+        this->add(&(this->bme280));
+    }
+
+private:
+    BME280<BME280_NAME, BME280_I2C_ADDR> bme280;
+};
+
+
+Device* createDevice() {
+    return new Bme280Device();
+}
+
+

devices/example-bme280/Readme.md

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+An example device featuring the [Bosch BME280](https://www.bosch-sensortec.com/bst/products/all_products/bme280) environmental sensor.
+
+It provides data on:
+ - barometric pressure
+ - relative humidity
+ - temperature