refactor: move document into specific folder

bot/api/document.go

@@ -0,0 +1,34 @@
+// Bot API 5.7
+
+package api
+
+// Document is a general file (as opposed to photos, voice messages and audio files).
+type Document struct {
+	// FileID is an identifier for this file, which can be used to download or reuse the file.
+	FileID string `json:"file_id"`
+
+	// FileUniqueID is a unique identifier for this file,
+	// which is supposed to be the same over time and for different bots.
+	// Can't be used to download or reuse the file.
+	FileUniqueID string `json:"file_unique_id"`
+
+	// Thumb is a document thumbnail as defined by sender.
+	//
+	// Optional.
+	Thumb *PhotoSize `json:"thumb,omitempty"`
+
+	// FileName is an original filename as defined by sender.
+	//
+	// Optional.
+	FileName string `json:"file_name,omitempty"`
+
+	// MimeType is MIME type of the file as defined by sender.
+	//
+	// Optional.
+	MimeType string `json:"mime_type,omitempty"`
+
+	// FileSize in bytes.
+	//
+	// Optional.
+	FileSize int `json:"file_size,omitempty"`
+}