Added "forth" link to other languages section of index.html (main page).

DOC/src/html/index.html

@@ -626,33 +626,46 @@ for pigpio.<br></p>
 <li><a href="https://hub.docker.com/r/zinen2/alpine-pigpiod">Docker</a>
 Note that pigpio does not support or accept issues relating to problems of running in docker. Use the docker projects own <a href="https://github.com/zinen/docker-alpine-pigpiod/issues">issue tracker</a> for that (zinen)</li>
 
-<li><a href="https://github.com/skvamme/pigpio">Erlang</a>
-(skvamme)</li>
+<li><a href="https://github.com/skvamme/pigpio">Erlang</a>(skvamme)</li>
+
+<li><a href="https://elinux.org/Forth#PIGPIO">Forth</a>(skvamme)</li>
+
 <li><a href="https://github.com/mattjlewis/pigpioj">Java</a> JNI
 wrapper around the pigpio C library (mattlewis)</li>
+
 <li><a href="https://github.com/mattjlewis/diozero">Java</a> via
 diozero, a high level wrapper around pigpio, Pi4J, wiringPi etc
 (mattlewis)</li>
+
 <li><a href="https://github.com/nkolban/jpigpio">Java</a>
 (nkolban)</li>
+
 <li><a href=
 "https://github.com/unosquare/pigpio-dotnet">.NET/mono</a>
 (unosquare)</li>
+
 <li><a href="https://github.com/fivdi/pigpio">Node.js</a>
 A wrapper for the pigpio C library (fivdi)</li>
+
 <li><a href="https://github.com/guymcswain/pigpio-client">Node.js</a>
 A client for pigpio socket interface (guymcswain)</li>
+
 <li><a href="https://metacpan.org/pod/RPi::PIGPIO">Perl</a> (Gligan
 Calin Horea)</li>
+
 <li><a href=
 "https://github.com/nak1114/ruby-extension-pigpio">Ruby</a>
 (Nak)</li>
+
 <li><a href=
 "https://github.com/vasmalltalk/pigpio-vast">Smalltalk</a>(Instantiations)</li>
+
 <li><a href=
 "https://github.com/UBogun/Xojo-pigpio">Xojo</a>(UBogun)</li>
+
 <li><a href=
 "https://github.com/eugenedakin/pigpio-GPIO">Xojo</a>(Eugene Dakin)</li>
+
 </ul>
 <hr style="width: 100%; height: 2px;">
 <p><font size="-2">The PWM and servo pulses are timed using the DMA