speedcrunch: add page (#7936)

pages/common/speedcrunch.md

@@ -0,0 +1,36 @@
+# speedcrunch
+
+> A high-precision scientific calculator.
+> More information: <https://www.speedcrunch.org>.
+
+- Start speedcrunch:
+
+`speedcrunch`
+
+- Copy the result of the most recent calculation:
+
+`Ctrl + R`
+
+- Open the formula book:
+
+`Ctrl + 1`
+
+- Clear the calculator of recent calculations:
+
+`Ctrl + N`
+
+- Wrap highlighted in parentheses (defaults to wrapping all if nothing selected):
+
+`Ctrl + P`
+
+- Load a speedcrunch session:
+
+`Ctrl + L`
+
+- Save a speedcrunch session:
+
+`Ctrl + S`
+
+- Toggle keypad:
+
+`Ctrl + K`