add: Megalodon, initial mastodon api

packages/megalodon/src/entities/attachment.ts

@@ -0,0 +1,49 @@
+namespace Entity {
+	export type Sub = {
+		// For Image, Gifv, and Video
+		width?: number;
+		height?: number;
+		size?: string;
+		aspect?: number;
+
+		// For Gifv and Video
+		frame_rate?: string;
+
+		// For Audio, Gifv, and Video
+		duration?: number;
+		bitrate?: number;
+	};
+
+	export type Focus = {
+		x: number;
+		y: number;
+	};
+
+	export type Meta = {
+		original?: Sub;
+		small?: Sub;
+		focus?: Focus;
+		length?: string;
+		duration?: number;
+		fps?: number;
+		size?: string;
+		width?: number;
+		height?: number;
+		aspect?: number;
+		audio_encode?: string;
+		audio_bitrate?: string;
+		audio_channel?: string;
+	};
+
+	export type Attachment = {
+		id: string;
+		type: "unknown" | "image" | "gifv" | "video" | "audio";
+		url: string;
+		remote_url: string | null;
+		preview_url: string | null;
+		text_url: string | null;
+		meta: Meta | null;
+		description: string | null;
+		blurhash: string | null;
+	};
+}