add sources

src/data.zig

@@ -14,9 +14,16 @@ pub const NodeID = enum {
 pub const Node = struct {
     name: [:0]const u8,
     description: [:0]const u8,
+    sources: ?[]Source,
     type: Type,
 };
 
+pub const Source = struct {
+    /// e.g. we want to live, q&a, etc.
+    medium: []const u8,
+    index: []const u8,
+};
+
 const Edge = struct {
     name: []const u8,
     source: NodeID,