Basic runtime template implementation

runtimes/crystal/README.md

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+# README
+
+This is the readme for people wanting to change this runtime,
+not for people trying to use it

runtimes/crystal/template/README.md.j2

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+# Readme for {{name | title}}
+
+This is a funko using the Crystal runtime for [FaaSO](https://git.ralsina.me/ralsina/faaso)
+
+## What is {{name | title}}
+
+Write here what it is
+
+## How to use {{name | title}}
+
+And so on.

runtimes/crystal/template/funko.cr

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+require "kemal"
+
+# This is a kemal app, you can add handlers, middleware, etc.
+
+# A basic hello world get endpoint
+get "/" do
+  "Hello World Crystal!"
+end
+
+# The `/ping/` endpoint is configured in the container as a healthcheck
+# You can make it better by checking that your database is responding
+# or whatever checks you think are important
+#
+get "/ping/" do
+  "OK"
+end

runtimes/crystal/template/funko.yml

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+name: hello
+runtime: crystal