Add 'Works in progress'

Works-in-progress.md

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+- [ ] Algorithm library
+    - Non allocating
+        - [ ] `sort`
+        - [ ] `stable_sort`
+        - [ ] `partition`
+        - [ ] `stable_partition`
+        - [ ] `minmax`
+        - [ ] `minmax_element`
+        - [ ] `is_permutation`
+        - [ ] `next_permutation`
+        - [ ] `prev_permutation`
+        - [ ] `make_heap`
+        - [ ] `push_heap`
+        - [ ] `lower_bound`
+        - [ ] `upper_bound`
+        - [ ] `binary_search`
+        - [ ] `includes`
+        - [ ] `equal`
+        - [ ] `lexicographical_compare` (using 3-way comparisons)
+        - [ ] `includes`