Add a readme linking to each example

Author: badeball

examples/readme.md

@@ -2,3 +2,8 @@
 
 The examples illustrates using each bundler in each language flavor.
 
+|            | CJS                    | ESM                    | TS                    |
+|------------|------------------------|------------------------|-----------------------|
+| Browserify | [Link](browserify-cjs) | [Link](browserify-esm) | [Link](browserify-ts) |
+| Esbuild    | [Link](esbuild-cjs)    | [Link](esbuild-esm)    | [Link](esbuild-ts)    |
+| Webpack    | [Link](webpack-cjs)    | [Link](webpack-esm)    | [Link](webpack-ts)    |