orca-c: add page (#7494)

pages/common/orca-c.md

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+# orca-c
+
+> A C-port of the ORCA live programming environment.
+> ORCA is an esoteric programming language for creating procedural sequencers.
+> More information: <https://github.com/hundredrabbits/Orca-c>.
+
+- Start ORCA with an empty workspace:
+
+`orca-c`
+
+- Start ORCA and open a specific file:
+
+`orca-c {{path/to/file.orca}}`
+
+- Start ORCA and set a specific tempo (defaults to 120):
+
+`orca-c --bpm {{beats_per_minute}}`
+
+- Start ORCA and set the size of the grid:
+
+`orca-c --initial-size {{columns}}x{{rows}}`
+
+- Start ORCA and set the maximum number of undo steps (defaults to 100):
+
+`orca-c --undo-limit {{limit}}`
+
+- Show the main menu inside of ORCA:
+
+`F1`
+
+- Show all shortcuts inside of ORCA:
+
+`?`
+
+- Show all ORCA operators inside of ORCA:
+
+`Ctrl + g`