Add charpeni/svelte-example into README tools

[charpeni]

Add charpeni/svelte-example into README tools.

Rollup plugins

• es output format
• Eslint
• Babel (presets: es2015 & stage-3)
• Svelte

Available examples

• Hello World component with default data & Two-Way binding (input)
• Counter component with default data and on:click directive with an observer on this value
• CatList and Cat components as nested components

[codecov-io]

Current coverage is 90.86% (diff: 100%)

Merging #117 into master will not change coverage

@@             master       #117   diff @@
==========================================
  Files            48         48          
  Lines          1324       1324          
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
  Hits           1203       1203          
  Misses          121        121          
  Partials          0          0          

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[Rich-Harris]

Thanks! I moved it into a dedicated examples section