Made Menu look a bit nicer, added function to add new Manga. Extracted Handler functions to handler.go, fixed bug where new Title would crash

Makefile

@@ -0,0 +1,11 @@
+run: develop
+	bin/develop
+
+develop:
+	go build -tags Develop -o bin/develop cmd/mangaGetter/main.go
+
+release:
+	go build -o bin/MangaGetter_unix cmd/mangaGetter/main.go
+
+win-amd64:
+	GOOS=windows GOARCH=amd64 go build -o bin/MangaGetter-amd64_windows.exe cmd/mangaGetter/main.go