init commit

.gitignore

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+node_modules/

README.md

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+Example
+
+```
+const survex = require('survex.js');
+
+survex.load((Survex) => {
+  Survex.imgOpen('http://10.42.0.203:8081/svn/skydusky/us/va/bland/Skydusky/Skydusky.3d')
+  .then(img => {
+    while (img.code >= 0) {
+      if (img.code === survex.codes['raw']['img_LABEL']) {
+        console.log(`label: ${img.label}, X: ${img.mv.x}, Y: ${img.mv.y}, Z: ${img.mv.z}`);
+      }
+      img = Survex.imgReadItem(img.ptr);
+    }
+  });
+});
+```

build.sh

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+#!/bin/bash
+
+emcc img.c img_shim.c \
+  -O3 \
+  -s EXPORTED_FUNCTIONS="['_free']" \
+  -s EXPORTED_RUNTIME_METHODS="['FS', 'getValue', 'UTF8ToString']" \
+  -o img.js
+#  -s FORCE_FILESYSTEM=1 \