Add more example app placeholders

Author: necolas

examples/example-cli/README.md

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+# @stylexjs/cli example using StyleX
+
+TBD

examples/example-esbuild/README.md

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+# esbuild example using StyleX
+
+TBD

examples/example-nextjs/README.md

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+# Next.js example using StyleX
+
 This is a [Next.js](https://nextjs.org/) project bootstrapped with [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app).
 
 ## Getting Started

examples/example-rollup/README.md

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+# Rollup example using StyleX
+
+TBD

examples/example-storybook/README.md

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+# Storybook example using StyleX
+
+TBD

examples/example-vite/README.md

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+# Vite example using StyleX
+
+TBD

examples/example-webpack/README.md

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+# Webpack example using StyleX
+
+TBD