api: Add go files

I know this is a huge commit, but I can't be bothered to check
this in part by part.

api/comment.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"time"
+)
+
+type comment struct {
+	CommentHex    string    `json:"commentHex"`
+	Domain        string    `json:"domain,omitempty"`
+	Path          string    `json:"url,omitempty"`
+	CommenterHex  string    `json:"commenterHex"`
+	Markdown      string    `json:"markdown"`
+	Html          string    `json:"html"`
+	ParentHex     string    `json:"parentHex"`
+	Score         int       `json:"score"`
+	State         string    `json:"-"`
+	CreationDate  time.Time `json:"creationDate"`
+	VoteDirection int       `json:"voteDirection"`
+}