Create debugging.md

docs/features/debugging.md

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+---
+icon: dot
+title: Debugging
+---
+
+After `v1.4.5`, you can invoke `breakpoint()` in your python code
+to start a PDB-like session.
+
+The following commands are supported:
+
++ `h, help`: show this help message
++ `q, quit`: exit the debugger
++ `n, next`: execute next line
++ `s, step`: step into
++ `w, where`: show current stack frame
++ `c, continue`: continue execution
++ `a, args`: show local variables
++ `p, print <expr>`: evaluate expression
++ `!, execute statement`: execute statement