update examples

example/nodejs-commonjs/language-pack/README.md

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+```bash
+npm install git+https://github.com/nextapps-de/flexsearch/tree/v0.8-preview
+```
+
+```bash
+node index.js
+```

example/nodejs-commonjs/language-pack/index.js

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+const { Index, Encoder, Charset } = require("flexsearch");
+const EnglishPreset = require("flexsearch/lang/en");
+
+const encoder = new Encoder(
+    Charset.LatinSimple,
+    EnglishPreset
+);
+
+// create a simple index which can store id-content-pairs
+const index = new Index({
+    tokenize: "forward",
+    encoder: encoder
+});
+
+// some test data
+const data = [
+    'She doesn’t get up at six o’clock.',
+    'It\'s been raining for five hours now.'
+];
+
+// add data to the index
+data.forEach((item, id) => {
+    index.add(id, item);
+});
+
+// perform query
+let result = index.search("she does not at clock");
+
+// display results
+result.forEach(i => {
+    console.log(data[i]);
+    console.log("-------------------------------------");
+});
+
+// perform query
+result = index.search("it is raining");
+
+// display results
+result.forEach(i => {
+    console.log(data[i]);
+});

example/nodejs-commonjs/language-pack/package.json

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+{
+  "name": "nodejs-commonjs-document",
+  "dependencies": {
+    "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview"
+  }
+}