add sort and find algorithm
Revert "Update README.md"

This reverts commit d9f3fafee8a5716c504744a3b516b8d9350b360e.
Revert "add sort and find algorithm"

This reverts commit 8517417cfcd2cff36a7f49e1e2576dd016ae77a3.
Revert "Revert "add sort and find algorithm""

This reverts commit 6c24cdc06f98d9cd3b6e18094150598601f2bdcc.