added basic http server

src/kotatsu.cr

@@ -1,6 +1,7 @@
 # TODO: Write documentation for `Kotatsu`
 
 require "option_parser"
+require "http/server"
 
 module Kotatsu
   VERSION = "0.1.0"
@@ -18,4 +19,14 @@ module Kotatsu
       exit
     end
   end
+
+  webserv = HTTP::Server.new do |context|
+    context.response.content_type = "text/plain"
+    context.response.print "Running kotatsu #{VERSION}"
+  end
+
+  webaddr = webserv.bind_tcp 8080
+  puts "Started kotatsu webserver on #{webaddr}"
+  webserv.listen
+
 end