Update READMEs

cpp/datastructs/README.md

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+# Datastructs
+
+A collection of useful datastructures written in C++. Examples of templating these
+structures in C++ can be found in the `templates/` directory.
+
+```
+klips/cpp/datastructs
+.
+├── binarysearchtree    # Binary search tree
+├── circledoublelist    # Circular doubly linked list
+├── circlesinglelist    # Circular singly linked list
+├── doublelist          # Doubly linked list
+├── maxheap             # Maximum heap
+├── queuelist           # Queue implementation using linked list
+├── README.md           
+├── singlelist          # Singly linked list
+├── stacklist           # Stack implementation using linked list
+├── templates           # Templated data structures
+└── vector
+```