docs: Add support for direct KiCad import of .kicad_mod files

docs/footprints/kicad-footprints.mdx

@@ -29,3 +29,171 @@ The text after `kicad:` follows the same convention as KiCad's `.pretty` directo
 ### Official KiCad footprint libraries
 
 You can browse the official KiCad footprint libraries to discover valid `<Library>/<FootprintName>` values to use with the `kicad:` prefix. See: [KiCad Footprints (GitLab)](https://gitlab.com/kicad/libraries/kicad-footprints).
+
+## Direct KiCad import
+
+You can also import `.kicad_mod` files directly from your project. tscircuit automatically converts them to circuit JSON format.
+
+import { TscircuitIframe } from "@site/src/components/TscircuitIframe"
+
+<TscircuitIframe fsMap={{"index.tsx": `import kicadMod from "./myfootprint.kicad_mod"
+export default () => (
+  <board width="10mm" height="10mm">
+    <chip
+      footprint={kicadMod}
+      name="U1"
+    />
+  </board>
+)`, "myfootprint.kicad_mod": `(footprint "R_0402_1005Metric"
+		(version 20241229)
+		(generator "kicad-footprint-generator")
+		(layer "F.Cu")
+		(descr "Resistor SMD 0402 (1005 Metric), square (rectangular) end terminal, IPC-7351 nominal, (Body size source: IPC-SM-782 page 72, https://www.pcb-3d.com/wordpress/wp-content/uploads/ipc-sm-782a_amendment_1_and_2.pdf), generated with kicad-footprint-generator")
+		(tags "resistor")
+		(property "Reference" "REF**"
+			(at 0 -1.17 0)
+			(layer "F.SilkS")
+			(effects
+				(font
+					(size 1 1)
+					(thickness 0.15)
+				)
+			)
+		)
+		(property "Value" "R_0402_1005Metric"
+			(at 0 1.17 0)
+			(layer "F.Fab")
+			(effects
+				(font
+					(size 1 1)
+					(thickness 0.15)
+				)
+			)
+		)
+		(attr smd)
+		(fp_line
+			(start -0.153641 -0.38)
+			(end 0.153641 -0.38)
+			(stroke
+				(width 0.12)
+				(type solid)
+			)
+			(layer "F.SilkS")
+		)
+		(fp_line
+			(start -0.153641 0.38)
+			(end 0.153641 0.38)
+			(stroke
+				(width 0.12)
+				(type solid)
+			)
+			(layer "F.SilkS")
+		)
+		(fp_line
+			(start -0.93 -0.47)
+			(end 0.93 -0.47)
+			(stroke
+				(width 0.05)
+				(type solid)
+			)
+			(layer "F.CrtYd")
+		)
+		(fp_line
+			(start -0.93 0.47)
+			(end -0.93 -0.47)
+			(stroke
+				(width 0.05)
+				(type solid)
+			)
+			(layer "F.CrtYd")
+		)
+		(fp_line
+			(start 0.93 -0.47)
+			(end 0.93 0.47)
+			(stroke
+				(width 0.05)
+				(type solid)
+			)
+			(layer "F.CrtYd")
+		)
+		(fp_line
+			(start 0.93 0.47)
+			(end -0.93 0.47)
+			(stroke
+				(width 0.05)
+				(type solid)
+			)
+			(layer "F.CrtYd")
+		)
+		(fp_line
+			(start -0.525 -0.27)
+			(end 0.525 -0.27)
+			(stroke
+				(width 0.1)
+				(type solid)
+			)
+			(layer "F.Fab")
+		)
+		(fp_line
+			(start -0.525 0.27)
+			(end -0.525 -0.27)
+			(stroke
+				(width 0.1)
+				(type solid)
+			)
+			(layer "F.Fab")
+		)
+		(fp_line
+			(start 0.525 -0.27)
+			(end 0.525 0.27)
+			(stroke
+				(width 0.1)
+				(type solid)
+			)
+			(layer "F.Fab")
+		)
+		(fp_line
+			(start 0.525 0.27)
+			(end -0.525 0.27)
+			(stroke
+				(width 0.1)
+				(type solid)
+			)
+			(layer "F.Fab")
+		)
+		(fp_text user "\${REFERENCE}"
+			(at 0 0 0)
+			(layer "F.Fab")
+			(effects
+				(font
+					(size 0.26 0.26)
+					(thickness 0.04)
+				)
+			)
+		)
+		(pad "1" smd roundrect
+			(at -0.51 0)
+			(size 0.54 0.64)
+			(layers "F.Cu" "F.Mask" "F.Paste")
+			(roundrect_rratio 0.25)
+		)
+		(pad "2" smd roundrect
+			(at 0.51 0)
+			(size 0.54 0.64)
+			(layers "F.Cu" "F.Mask" "F.Paste")
+			(roundrect_rratio 0.25)
+		)
+		(embedded_fonts no)
+		(model "\${KICAD9_3DMODEL_DIR}/Resistor_SMD.3dshapes/R_0402_1005Metric.step"
+			(offset
+				(xyz 0 0 0)
+			)
+			(scale
+				(xyz 1 1 1)
+			)
+			(rotate
+				(xyz 0 0 0)
+			)
+		)
+	)
+	`}} />