Changed readme template

Updated documentation

interfaces.go

@@ -0,0 +1,31 @@
+package ps
+
+// Group represents a Document or LayerSet.
+type Group interface {
+	Name() string
+	Parent() Group
+	SetParent(Group)
+	Path() string
+	ArtLayer(name string) *ArtLayer
+	LayerSet(name string) *LayerSet
+	ArtLayers() []*ArtLayer
+	LayerSets() []*LayerSet
+	MustExist(name string) Layer
+	MarshalJSON() ([]byte, error)
+	UnmarshalJSON(b []byte) error
+}
+
+// Layer represents an ArtLayer or LayerSet Object.
+type Layer interface {
+	Bounds() [2][2]int
+	MarshalJSON() ([]byte, error)
+	Name() string
+	Parent() Group
+	Path() string
+	Refresh() error
+	SetParent(g Group)
+	SetPos(x, y int, bound string)
+	SetVisible(b bool) error
+	UnmarshalJSON(b []byte) error
+	Visible() bool
+}