Add README with a quick deploy guide

README.md

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+# XMPP invitation page
+
+Build a Web page to help people joining US on XMPP.
+
+![Example of XMPP invitation page](screenshot_invitation_page.png)
+
+
+## Quick deploy guide
+
+Install `fcgiwrap`.
+
+```
+mkdir -p /var/www/xmpp-invitation
+cd /var/www/xmpp-invitation
+git clone https://forge.chapril.org/pitchum/xmpp-invitation-page.git .
+```
+
+Nginx snippet:
+
+```
+  location /invitation-beta/assets/ {
+    alias  /var/www/xmpp-invitation/assets/;
+  }
+  location /invitation-beta/ {
+    root  /var/www/xmpp-invitation/;
+    index invitation.cgi;
+
+    fastcgi_pass  unix:/run/fcgiwrap.socket;
+    include /etc/nginx/fastcgi_params;
+    fastcgi_param SCRIPT_FILENAME  /var/www/xmpp-invitation/invitation.cgi;
+  }
+```
+