add description and usage

README.md

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+# Flaschenring Generator
+
+## Requirements
+- Inkscape 1.2.2 (732a01da63, 2022-12-09) or above
+- Git Bash or other bash interpreter
+
+## Usage
+
+```./generate_flaschenring.sh "Your Name"```
+
+This will create a file called "flaschenring_Your Name.svg".
+Import into laser cutter software.
+
+### Settings
+
+Setting recommendations for Lightburn on a 100W CO2 Lasercutter.
+
+#### 4mm Plywood
+
+- Outlines: Line, 100%, 30mm/sec, 1 pass
+- Text: Line, 30%, 300mm/sec, 1 pass
+- **or** Text: Fill, 30%, 300mm/sec, 1 pass, 0.2mm interval