Add docs

docs/archs/arm-openocd.md

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+## ARMOpenOCD
+
+The ARM OpenOCD architecture is a special arcthtecture used with the `gef-openocd-remote` command.
+Please read the [documentation](../commands/gef-openocd-remote.md) for the command.

docs/commands/gef-openocd-remote.md

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+## Command gef-openocd-remote
+
+The `gef-openocd-command` is used with the [`ARMOpenOCD`](../../archs/arm-openocd.py] architecture.
+
+The [arm-openocd.py](../../archs/arm-openocd.py) script adds an easy way to extend the `gef-remote`
+functionality to easily debug ARM targets using a OpenOCD gdbserver. It creates a custom ARM-derived
+`Architecture`, as well as the `gef-openocd-remote` command, which lets you easily connect to the
+target, optionally loading the accompanying ELF binary.
+
+### Usage
+
+```bash
+gef-openocd-remote localhost 3333 --file /path/to/elf
+```