diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,33 @@
+# KiCad
+*.bak
+*-backups/
+*-cache.lib
+*-cache.dcm
+*.kicad_prl
+*.kicad_pcb-bak
+*~
+\#*#
+_autosave-*
+*.tmp
+fp-info-cache
+
+# Gerber output
+gerbers/
+manufacturing/
+
+# Build artifacts
+firmware/build/
+firmware/.pio/
+*.o
+*.elf
+*.hex
+*.bin
+*.map
+
+# IDE
+.vscode/
+.idea/
+
+# OS
+.DS_Store
+Thumbs.db
diff --git a/README.md b/README.md
index 3965977..4f8a2e8 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,35 @@
 # SN-L00
 
-Eurorack latency testing module
\ No newline at end of file
+Eurorack latency testing module by SubModular.
+
+## Overview
+
+SN-L00 measures round-trip latency in Eurorack signal chains. Useful for testing delay through effects, digital modules, audio interfaces, and DAW processing.
+
+## Project Structure
+
+```
+hardware/
+  kicad/      # Schematics and PCB
+  panel/      # Front panel design
+firmware/     # Microcontroller code (if applicable)
+docs/         # Documentation and user manual
+```
+
+## Specifications
+
+- Width: TBD HP
+- Power: TBD mA (+12V), TBD mA (-12V)
+- Depth: TBD mm
+
+## Status
+
+Early development - concept phase.
+
+## License
+
+TBD
+
+---
+
+*SubModular - Eurorack hardware by Sub-Net e.U.*
diff --git a/docs/.gitkeep b/docs/.gitkeep
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index 0000000..e69de29
diff --git a/firmware/.gitkeep b/firmware/.gitkeep
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diff --git a/hardware/kicad/.gitkeep b/hardware/kicad/.gitkeep
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diff --git a/hardware/panel/.gitkeep b/hardware/panel/.gitkeep
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index 0000000..e69de29