Added readme file for keeping a log of the project...and troubleshooting logs.

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+# CR10S with BLTouch (3.1) and Marlin 2.0.x
+
+## Why try 2.0?
+Installation of BLTouch has been done following instructions that shipped with the kit (Creality kit) and all is working using the precompiled version of Marlin (1.1.6) that Creality provides.
+ABL is working as well.
+
+It only covers the 3x3 point ABL and I would like to experiment with more probe points but most important is to remove support for "Power loss detection" which writes each OP onto the SD-card...
+
+## Wiring & installation
+Premise: Since it is working in precompiled firmware provided by Creality, I assume the wiring is sound?
+
+## Troubleshooting
+
+### 2021-05-20
+**Marlin version: 2.0.8.1 (using CR10S example config as base)**
+
+- Flashed 2.0.8.1 (using CR10S V1 example config as base and applied changes for enabling BLTouch)
+- Specified Z-probe offset to -2.58 (which worked and was used in 1.1.6 blob provided by Creality with BLTouch support)
+
+**Testing of endstops**
+- M119 while triggering endstop for X -> Triggered
+- M119 while not triggering endstop for X -> open
+- M119 while triggering endstop for Y -> Triggered
+- M119 while not triggering endstop for Y -> open
+- Deploying BLTouch probe from within BLTouch control panel.
+- M119 while probe is deployed: Z -> open
+- Stowing probe (with a paper)
+- M119 while probe is stowed: Z -> Triggered
+
+**Testing homing of axes**
+- G28 X -> Homes X without any problem (issued multiple times in a row with correct outcome)
+- G28 Y -> Homes Y without any problem (issued multiple times in a row with correct outcome)
+- G28 Z -> Moves to safe homing place, deploys probe and then moves up a tiny bit and then down a tiny but (all in mid air, say 5cm above bed). Probe never touches the bed.
+
+**Note**: If i ONLY do homing of X and Y it works in arbitrary order, but as soon I've tried to home Z and then issuing G28 X or Y the printer halts.
+
+### 2020-02-22
+**Marlin version: 2.0.3 (using CR10S example config as base)**
+Enabled PINS_DEBUGGING and ran M43 S which gave the following:
+    Servo probe test
+    - using index: 0, deploy angle: 10, stow angle: 90
+    - Probe Z_MIN_PIN: 18
+    - Z_MIN_ENDSTOP_INVERTING: false
+    - Check for BLTOUCH
+    = BLTOUCH Classic 1.2, 1.3, Smart 1.0, 2.0, 2.2, 3.0, 3.1 detected
+    ** Please trigger probe within 30 sec **
+    . Pulse width: 30ms or more
+    = BLTOUCH V3.1 detected.
+    ok P15 B3
+
+See thread at reddit.com: https://www.reddit.com/r/CR10/comments/f7h4cn/cr10s_with_bltouch_and_marlin_20x
+
+