Add more topics / references and a informative on type of reference

resources/topic-graph.mmd

@@ -12,3 +12,13 @@ graph TD
     PL --> FunPL[Functional Programming Languages]
       FunPL --> Haskell
       FunPL --> Lisp
+  SW --> PT[Programming Topics]
+    PT --> ALG[Algorithms]
+      ALG --> SRT[Sorting]
+      ALG --> CPX[Complexity]
+    PT --> DS[Data Scructures]
+      DS --> Graph[Graph]
+      DS --> T3[Tree]
+      DS --> HS[Hash]
+  SW --> OPS[Operations]
+      OPS --> OS[Operating Systems]