add state doc

doc/state.md

+title: The 66 Suite: 66-instate
+author: Eric Vidal <eric@obarun.org>
+
+[66](index.html)
+
+[Software](https://web.obarun.org/software)
+
+[obarun.org](https://web.obarun.org)
+
+# 66-instate
+
+This command displays the contents of the service's *state* file.
+
+## Interface
+
+```
+state [ -h ] service
+```
+
+66-instate displays the contents of the service's *state* file. This file are used internally by the *66* tools to know runtime *service* information. This tool is purely a debug tool used by developers.
+
+## Exit codes
+
+- *0* success
+- *100* wrong usage
+- *111* system call failed
+
+## Options
+
+- **-h**: prints this help;
+
+- **-z**: use color.
+
+- **-t** *tree*: only searches the service at the specified *tree*, when the same service may be enabled in more trees.
+
+- **-l**: displays the contents of the associated logger's *state* file if any.