Announce that SD is unmaintained

Changes

1 changed files (+2/-2)

• README.md
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    # SD + **⚠️ SD is unmaintained!** You should use the C port [SDC](/sdc) instead. + Very efficient flash cards app using Go and SQLite ## Usage
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    ## Performance SD is designed to be extremely efficient in order to support a very large number of flash cards and should be able to handle millions of cards with ease. If `N` is the number of cards, initializing the program requires `O(N)` time and `O(N)` memory. Selecting a random card and adjusting its weight requires `O(log N)` time. Internally SD uses [segment trees](https://en.wikipedia.org/wiki/Segment_tree) to achieve this time complexity. - - A C port for maximal speed and minimal executable size can be found [here](https://git.exozy.me/Ta180m/CD).