Update README.md

README.md

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 # ChatCalc112
-Adds an ingame calculator.
+Adds an ingame calculator with some special functionality.
+
+## Normal Calculator
+For detailed instructions refer to the [original mod](https://github.com/jrddp/ChatCalc)
+
+`3+3 -> TAB -> 6`
+
+## Stack Calculator
+Stolen from my 1.18 mod [StackCalc](https://github.com/TomB-134/StackCalc)
+
+To use it, open chat and type your number and add "s" to the end of it (e.g 1234s) and then simply press the tab key.\
+For larger numbers you can also type "sb" and that will calculate shulker boxes as well. For example "12345sb" will become "7 (Shulker Boxes) + 3 (Stacks) + 57 (Items)".\
+There is also a double chest calculator if you care. Use it the same way "dc"
+
+`1234s" -> TAB -> "19 (Stacks) + 18 (Items)`
+
+`12345sb" -> TAB -> "7 (Shulker Boxes) + 3 (Stacks) + 57 (Items)`
 
-Port of [this](https://github.com/jrddp/ChatCalc)