Add docs folder

Author: canchebagur

docs/api.md

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+# ArduinoLPS22HB library
+
+## Methods
+
+### `begin()`
+
+Initialize the pressure sensor.
+
+#### Syntax 
+
+```
+BARO.begin()
+```
+
+#### Parameters
+
+None.
+
+#### Returns
+
+1 on success, 0 on failure.
+
+#### Example
+
+```
+if (!BARO.begin()) {
+    Serial.println("Failed to initialize pressure sensor!");
+    while (1);
+}
+```
+
+#### See also
+
+* [end()](#end)
+* [readPressure()](#readPressure)
+
+### `end()`
+
+De-initialize the pressure sensor.
+
+#### Syntax 
+
+```
+BARO.end()
+```
+
+#### Parameters
+
+None.
+
+#### Returns
+
+None.
+
+#### Example
+
+```
+if (!BARO.begin()) {
+    Serial.println("Failed to initialize pressure sensor!");
+    while (1);
+}
+
+// ...
+
+BARO.end();
+```
+
+#### See also
+
+* [begin()](#begin)
+* [readPressure()](#readPressure)
+
+### `readPressure()`
+
+Read the sensor's measured pressure value.
+
+
+#### Syntax 
+
+```
+BARO.readPressure()
+BARO.readPressure(units)
+```
+
+#### Parameters
+
+* _units_: `PSI`  to read the pressure in PSI (pounds per square inch), `MILLIBAR` to read the pressure in millibars and `KILOPASCALS` to read the pressure in kilopascals. If unit parameter is not provided, default is kilopascals   .
+
+#### Returns
+
+The pressure in PSI, millibar or kilopascal, depending on the units requested.
+
+#### Examples
+
+```
+float pressure = BARO.readPressure();
+
+Serial.print("Pressure = ");
+Serial.print(pressure);
+Serial.println(" kPa");
+```
+
+#### See also
+
+* [begin()](#begin)
+* [end()](#end)

docs/readme.md

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+# ArduinoLPS22HB library
+
+
+The ArduinoLPS22HB library allows you to use the LPS22HB sensor available on the Arduino® Nano 33 BLE Sense board to read the air pressure.
+
+To use this library:
+
+```
+#include <Arduino_LPS22HB.h>
+```
+
+Main features of the HTS221 sensor:
+
+- Absolute pressure range: 260 to 1260 hPa.
+