docs: update documentation

Add documentation for the new configuration file format, as well as the
new `ocid config` subcommand and the changed --socket option.

Signed-off-by: Aleksa Sarai <asarai@suse.de>

docs/ocid.conf.5.md

@@ -0,0 +1,67 @@
+% ocid.conf(5) Open Container Initiative Daemon
+% Aleksa Sarai
+% OCTOBER 2016
+
+# NAME
+ocid.conf - Syntax of OCID configuration file
+
+# DESCRIPTION
+The OCID configuration file specifies all of the available command-line options
+for the ocid(8) program, but in a TOML format that can be more easily modified
+and versioned.
+
+# FORMAT
+The [TOML format][toml] is used as the encoding of the configuration file.
+Every option and subtable listed here is nested under a global "ocid" table.
+No bare options are used. The format of TOML can be simplified to:
+
+    [table]
+    option = value
+
+    [table.subtable1]
+    option = value
+
+    [table.subtable2]
+    option = value
+
+## OCID TABLE
+
+The `ocid` table supports the following options:
+
+
+**container_dir**=""
+  OCID container dir (default: "/var/lib/ocid/containers")
+
+**root**=""
+  OCID root dir (default: "/var/lib/ocid")
+
+**sandbox_dir**=""
+  OCID pod sandbox dir (default: "/var/lib/ocid/sandboxes")
+
+
+## OCID.API TABLE
+
+**listen**=""
+  Path to ocid socket (default: "/var/run/ocid.sock")
+
+## OCID.RUNTIME TABLE
+
+**conmon**=""
+  path to the conmon executable (default: "/usr/libexec/ocid/conmon")
+
+**runtime**=""
+  OCI runtime path (default: "/usr/bin/runc")
+
+**selinux**
+  Enable selinux support (default: false)
+
+## OCID.IMAGE TABLE
+
+**pause**=""
+  Path to the pause executable (default: "/usr/libexec/ocid/pause")
+
+# SEE ALSO
+ocid(8)
+
+# HISTORY
+Oct 2016, Originally compiled by Aleksa Sarai <asarai@suse.de>