Add package.json and npm install instructions

Adds bin entry so kicad-query is available as a global command
after npm install -g. Also marks the script executable.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -0,0 +1,15 @@
+{
+	"name": "claude-kicad-helper",
+	"version": "1.0.0",
+	"description": "Query tool for KiCad schematics and PCB files — extracts components, nets and trace routing without the noise",
+	"type": "module",
+	"bin": {
+		"kicad-query": "./kicad-query.mjs"
+	},
+	"engines": {
+		"node": ">=18"
+	},
+	"keywords": ["kicad", "eda", "pcb", "schematic", "electronics"],
+	"author": "mikael-lovqvists-claude-agent",
+	"license": "MIT"
+}