add pins docstrings and base class init parameters

Author: Neradoc

adafruit_ads1x15/ads1015.py

@@ -28,9 +28,13 @@
 
 # Pins
 P0 = 0
+"""Analog Pin 0"""
 P1 = 1
+"""Analog Pin 1"""
 P2 = 2
+"""Analog Pin 2"""
 P3 = 3
+"""Analog Pin 3"""
 
 
 class ADS1015(ADS1x15):

adafruit_ads1x15/ads1115.py

@@ -29,9 +29,13 @@
 
 # Pins
 P0 = 0
+"""Analog Pin 0"""
 P1 = 1
+"""Analog Pin 1"""
 P2 = 2
+"""Analog Pin 2"""
 P3 = 3
+"""Analog Pin 3"""
 
 
 class ADS1115(ADS1x15):

adafruit_ads1x15/ads1x15.py

@@ -48,11 +48,21 @@ class Mode:
     # values here are masks for setting MODE bit in Config Register
     # pylint: disable=too-few-public-methods
     CONTINUOUS = 0x0000
+    """Continuous Mode"""
     SINGLE = 0x0100
+    """Single-Shot Mode"""
 
 
 class ADS1x15:
-    """Base functionality for ADS1x15 analog to digital converters."""
+    """Base functionality for ADS1x15 analog to digital converters.
+
+    :param ~busio.I2C i2c: The I2C bus the device is connected to.
+    :param float gain: The ADC gain.
+    :param int data_rate: The data rate for ADC conversion in samples per second.
+                          Default value depends on the device.
+    :param Mode mode: The conversion mode, defaults to `Mode.SINGLE`.
+    :param int address: The I2C address of the device.
+    """
 
     def __init__(
         self,