More docs

src/kemal.cr

@@ -1,4 +1,7 @@
 require "http"
+require "json"
+require "uri"
+require "tempfile"
 require "./kemal/*"
 require "./kemal/helpers/*"
 

src/kemal/handler.cr

@@ -1,4 +1,8 @@
-class Kemal::Handler
+module Kemal
+  # `Kemal::Handler` is a subclass of `HTTP::Handler`.
+  # It adds `only`, `only_match?`, `exclude`, `exclude_match?`.
+  # These methods are useful for custom handlers for conditional execution.
+  class Handler
     include HTTP::Handler
     @@only_routes_tree = Radix::Tree(String).new
     @@exclude_routes_tree = Radix::Tree(String).new
@@ -62,4 +66,5 @@ class Kemal::Handler
     private def radix_path(method : String, path)
       "#{self.class}/#{method.downcase}#{path}"
     end
+  end
 end

src/kemal/init_handler.cr

@@ -1,6 +1,6 @@
 module Kemal
-  # Kemal::InitHandler is the first handler thus initializes the context with default values such as
+  # Kemal::InitHandler is the first handler thus initializes the context with default values.
-  # Content-Type, X-Powered-By.
+  # Such as *Content-Type*, *X-Powered-By* headers.
   class InitHandler
     include HTTP::Handler
     INSTANCE = new

src/kemal/param_parser.cr

@@ -1,7 +1,3 @@
-require "json"
-require "uri"
-require "tempfile"
-
 module Kemal
   # ParamParser parses the request contents including query_params and body
   # and converts them into a params hash which you can within the environment

src/kemal/request.cr

@@ -1,4 +1,3 @@
-# Opening HTTP::Request to add override_method property
 class HTTP::Request
   property override_method
   property url_params : Hash(String, String)?