add selfoss on centos7 guide

docs/index.md

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 * [Quick Dirty Postgresql Nspawn Container on Arch Linux](arch_postgresql_nspawn.md)
 * [Misc Tips, Trouble Shooting](misc_tips_troubleshooting.md)
 * [Self Signed Certs](self_signed_certs.md)
+* [Selfoss on Centos7](selfoss_on_centos7.md)
 
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     * [Template](Template.md)

docs/selfoss_on_centos7.md

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+# Selfoss on Centos 7
+
+The target here is a very low resource vps running Centos7.
+You can use mysql or postgresql, but performance is fine with sqlite database.
+You'll need the epel repo in order to install python2-certbot-apache.
+
+[Here's a great guide for setting up apache with letsencrypt on Centos7](https://www.digitalocean.com/community/tutorials/how-to-secure-apache-with-let-s-encrypt-on-centos-7).
+
+You'll want to install the following packages
+
+* mod_ssl
+* python2-certbot-apache
+* php
+* php-gd
+* php-http
+* php-pdo
+* unzip
+* wget
+
+[The documentation](https://selfoss.aditu.de/) explains how to set up
+the config.ini and .htaccess files, RewriteEngine, RewriteBase,
+database, and explains the apache modules that you
+want enabled. Hint, use `apachectl -M`, `apachectl help`, etc.
+
+You'll probably want to extract the 
+application to `/var/www/html/selfoss/` or similar, and then add a configuration.
+
+```conf
+# /etc/httpd/conf.d/selfoss.conf
+Alias "/selfoss/" "/var/www/html/selfoss/"
+<Directory "/var/www/html/selfoss">
+        Options FollowSymLinks
+        AllowOverride All
+</Directory>
+```
+
+Make sure that the selfoss directory is owned by apache:apache.