examples: intro a README file to emscripten examples

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

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+# Hello world
+
+Minimal example using the standard Nit hello world program. The Nit code will be evaluated and executed once as soon as it is loaded. Standard output is redirected to the `console` element.
+
+# Fibonacci
+
+The Nit program is executed only when an input is supplied. The input is passed as the main arguments.
+
+This is not ideal, the whole Nit program is executed at each call.