add a readme

README.md

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+# My PrusaSlicer Settings
+by Jannik Beyerstedt from Hamburg, Germany  
+[jannikbeyerstedt.de](https://jannikbeyerstedt.de) | [Github](https://github.com/jbeyerstedt) | [Private Git Server](https://git.jannikbeyerstedt.de)  
+**license:** CC-BY-SA-4.0
+
+Some of these settings are quite specific to my RepRap Prusa i3 (MK1) printer, because it wasn't built from a standard kit.
+See [my website](https://jannikbeyerstedt.de/projekte/3d-drucker) for a little build blog.
+
+
+## Installation
+Clone this repository to the settings file directory of PrusaSlicer.
+- macOS: `~/Library/Application Support/PrusaSlicer`
+- Linux: TODO
+- Windows: TODO
+
+Previously I cloned the repository to my documents folder and then symlinked `~/Library/Application Support/PrusaSlicer` to it.
+But this does not work any more with macOS Catalina, because the sandbox prevents the slicer to access the user's documents.
+
+
+## Printer Specs
+- Prusa i3, sheet model
+    - wodden sheets, watercut. Re-enforced at the top by some piece of wood. X-axis mirrored.
+    - NEMA17 stepper motors
+    - T2.5 belts, M5 screws as Z-axis spindle
+    - mkII heatbed
+    - J-Head Hotend for 3 mm filament
+    - Greg´s Wade Extruder
+    - RAMPS 1.4 electronics with Pololu drivers
+    - 200W 12V power supply by meanwell
+- OctoPrint
+    - Octolapse plugin for better timelapses (pictures of each layer from the top)