adding ceus-wus tectonic boundary

etc/nshm/wus-ceus-boundary.geojson

+{
+  "type": "Feature",
+  "geometry": {
+    "type": "LineString",
+    "coordinates": [
+      [ -113.70, 50.00 ],
+      [ -113.35, 49.00 ],
+      [ -112.20, 47.55 ],
+      [ -110.90, 46.45 ],
+      [ -110.45, 45.75 ],
+      [ -110.00, 45.50 ],
+      [ -110.10, 44.90 ],
+      [ -109.90, 44.55 ],
+      [ -109.85, 44.15 ],
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+      [ -110.90, 36.80 ],
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+      [ -108.45, 35.00 ],
+      [ -107.60, 35.50 ],
+      [ -107.15, 35.90 ],
+      [ -106.90, 36.25 ],
+      [ -106.85, 36.65 ],
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+      [ -107.55, 37.30 ],
+      [ -107.75, 37.55 ],
+      [ -107.80, 37.85 ],
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+      [ -106.25, 38.55 ],
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+      [ -105.62, 38.08 ],
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+      [ -105.35, 33.25 ],
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+      [ -102.10, 29.60 ],
+      [ -101.00, 29.20 ]
+    ]
+  },
+  "properties": {
+    "stroke": "#FC4445",
+    "title": "WUS-CEUS Craton Boundary"
+  }
+}