Add examples for React 16 and Next.js 10

examples/nextjs-10/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# next.js
+/.next/*
+!/.next/static/
+/out/
+
+# production
+/build
+
+# development
+/.yalc
+yalc.lock
+
+# misc
+.DS_Store
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# local env files
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local

examples/nextjs-10/README.md

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+This is a starter template for [Learn Next.js](https://nextjs.org/learn).

examples/nextjs-10/next.config.js

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+module.exports = {
+  webpack(config, { isServer })  {
+    if (!isServer) {
+      config.devtool = 'source-map'
+    }
+
+    return config
+  }
+}