Added param parser

spec/param_parser_spec.cr

@@ -0,0 +1,16 @@
+require "./spec_helper"
+
+describe "ParamParser" do
+  it "parses params" do
+    kemal = Kemal::Handler.new
+    kemal.add_route "POST", "/" do |env|
+      name = env.params["name"]
+      age = env.params["age"]
+      hasan = env.params["hasan"]
+      "Hello #{name} #{hasan} #{age}"
+    end
+    request = HTTP::Request.new("POST", "/?hasan=cemal", body: "name=kemal&age=99")
+    response = kemal.call(request)
+    response.body.should eq("Hello kemal cemal 99")
+  end
+end