Relocate configs above Marlin/src folder (#13299)

config/examples/Felix/README.md

@@ -0,0 +1,60 @@
+# Felix 2.0/3.0 Configuration for Marlin Firmware
+
+Bringing silky smooth prints to Felix.
+
+## Build HOWTO
+
+  - Install the latest non-beta Arduino software IDE/toolset: http://www.arduino.cc/en/Main/Software
+  - Download the Marlin firmware
+    - [Latest developement version](https://github.com/MarlinFirmware/Marlin/tree/Development)
+    - [Stable version](https://github.com/MarlinFirmware/Marlin/tree/Development)
+  - In both cases use the "Download Zip" button on the right.
+
+```
+cd Marlin/src
+cp config/examples/Felix/Configuration_adv.h .
+```
+
+The next step depends on your setup:
+
+### Single Extruder Configuration
+
+    cp config/examples/Felix/Configuration.h .
+
+### Dual Extruder Configuration
+
+    cp config/examples/Felix/DUAL/Configuration.h Configuration.h
+
+### Compile Firmware
+
+  - Start the Arduino IDE.
+  - Select Tools -> Board -> Arduino Mega 2560
+  - Select the correct serial port in Tools -> Serial Port (usually /dev/ttyUSB0)
+  - Open Marlin.pde or .ino
+  - Click the Verify/Compile button
+
+### Flash Firmware
+
+#### Connected directly via USB
+
+  - Click the Upload button. If all goes well the firmware is uploading
+
+#### Remote update
+
+Find the latest Arduino build:
+
+    ls -altr /tmp/
+    drwxr-xr-x 5 chrono users 12288 Mar 3 21:41 build6072035599686630843.tmp
+
+Copy the firmware to your printer host:
+
+    scp /tmp/build6072035599686630843.tmp/Marlin.cpp.hex a.b.c.d:/tmp/
+
+Connect to your printer host via ssh, stop Octoprint or any other service that may block your USB device and make sure you have avrdude installed, then run:
+
+    avrdude -C/etc/avrdude.conf -v -v -v -patmega2560 -cwiring -P/dev/ttyUSB0 \
+    -b115200 -D -Uflash:w:/tmp/Marlin.cpp.hex:i
+
+## Acknowledgements
+
+Mashed together and tested on https://apollo.open-resource.org/mission:resources:picoprint based on collaborative teamwork of @andrewsil1 and @thinkyhead.