use/supybot-botchk.rst: document supybot-botchk

and update .gitignore which was missing some other directories too.

.gitignore

@@ -4,3 +4,6 @@
 _build
 conf/
 logs/
+backup/
+data/
+tmp/

use/index.rst

@@ -13,3 +13,4 @@ The Supybot user guide
     capabilities.rst
     faq.rst
     httpserver.rst
+    supybot-botchk.rst

use/supybot-botchk.rst

@@ -0,0 +1,72 @@
+.. _supybot-botchk:
+
+##############
+supybot-botchk
+##############
+
+supybot-botchk is a script that comes with Supybot which restarts the bot
+if it quits or system reboots or anything that causes the bot to quit. It's
+placed to crontab so cron will run it with scheduled intervals.
+
+How to use it?
+==============
+
+Configuring the bot
+-------------------
+
+Start by telling your bot to write a pidfile somewhere where it can write
+and restart the bot. For example::
+
+    config supybot.pidfile /home/<username>/<bot>/<bot>.pid
+
+where <username> is replaced with the system username and <bot> is replaced
+with the name of the bot.
+
+crontab
+-------
+
+After the pidfile is configured, you can modify crontab. First you should
+copy the output of::
+
+    printf 'PATH=%s\n' "$PATH"
+
+and open crontab with ``EDITOR=nano crontab -e`` and paste the output of
+previous command to the first lines which don't have comments. This should
+be on top. You will probably also want to configure locale and timezone
+which happens by adding the following lines::
+
+    # Replace en_US.utf8 with your own locale! You should see list of
+    # available locales with `locale` command, just use something which
+    # ends with "utf8".
+    LC_ALL=en_US.utf8
+    
+    # Specifying timezone is optional, but you probably want to do it if
+    # your system is on different timezone. Replace ``UTC`` with 
+    # ``Area/Region`` as it appears in IANA Time Zone Database if you don't
+    # want to use UTC.
+    TZ=UTC
+
+NOTE: Lines starting with # are comments and don't need to be written.
+
+Now you finally add the bot. If you have multiple bots, simply add separate
+lines for them all::
+
+    */5 * * * * supybot-botchk --botdir=/home/<username>/<bot>/ --pidfile=/home/<username>/<bot>/<bot>.pid --conffile=/home/<username>/<bot>/<bot>.conf
+
+If you needed to use diferent environment for other bot, you could specify
+that on the same line. For example, my other bot uses en_US.utf8 as locale
+and UTC as timezone::
+
+    */5 * * * * LC_ALL=en_US.utf8 TZ=UTC supybot-botchk --botdir=/home/<username>/<bot2>/ --pidfile=/home/<username>/<bot2>/<bot2>.pid --conffile=/home/<username>/<bot2>/<bot2>.conf
+
+Note that environment doesn't need to be specified on supybot-botchk line
+unless it differs from globally specified environment which we added as the
+first thing to crontab.
+
+Now you can save the crontab by pressing ``CTRL + O`` answering ``y`` and
+then quitting nano with ``CTRL + X``.
+
+If you are wondering what ``*/5 * * * *`` means, it simply means "run this
+every five minutes every day". The 5 can be replaced with any other number
+and there are also ``@hourly`` etc. which can be used on it's place, but
+you most likely won't want to wait hour or more if your bot crashes.