Copy Encoder module comments to README.md

Author: dplanella

Adafruit_BBIO/README.md

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+# ===========================================================================
+# Adafruit_BBIO.Encoder Class
+# ===========================================================================
+# refers to graycatlabs/PyBBIO/bbio/libraries/RotaryEncoder/rotary_encoder.py
+
+# BeagleBone must boot with cape-universal enabled
+# and load the cape-universala overlay in order to
+# use all the eQEP pins
+#
+# Install the latest Device Tree overlays:
+# ========================================
+# sudo apt-get upgrade bb-cape-overlays
+#
+# File: /boot/uEnv.txt
+# ====================
+# uname_r=4.4.62-ti-r99
+# cmdline=coherent_pool=1M quiet cape_universal=enable
+# cape_enable=bone_capemgr.enable_partno=cape-universala
+#
+# File: /sys/devices/platform/bone_capemgr/slots
+# ==============================================
+# 0: PF----  -1 
+# 1: PF----  -1 
+# 2: PF----  -1 
+# 3: PF----  -1 
+# 4: P-O-L-   0 Override Board Name,00A0,Override Manuf,cape-universala
+#
+# eqep0: P9_27, P9_92
+# ===================
+# config-pin P9_27 qep
+# config-pin P9_92 qep # alias for P9_42.1
+# cat /sys/devices/platform/ocp/48300000.epwmss/48300180.eqep/position
+#
+# eqep1: P8.33, P8.35
+# ===================
+# config-pin P8.33 qep 
+# config-pin P8.35 qep
+# cat /sys/devices/platform/ocp/48302000.epwmss/48302180.eqep/position
+# 
+# eqep2: P8.11, P8.12
+# ===================
+# config-pin P8.11 qep 
+# config-pin P8.12 qep 
+# cat /sys/devices/platform/ocp/48304000.epwmss/48304180.eqep/position
+#
+# alternate pins for eqep2 (mutually exclusive)
+# eqep2b: P8.41, P8.42
+# ====================
+# config-pin P8.41 qep 
+# config-pin P8.42 qep 
+# cat /sys/devices/platform/ocp/48304000.epwmss/48304180.eqep/position