some basic structure for the five day intro to Pd workshop

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diff --git a/doc/tutorials/visual/03.render_chains.pd b/doc/tutorials/visual/03.render_chains.pd
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+#N canvas 548 149 488 377 10;
+#X obj 8 10 cnv 15 400 40 empty empty render_chains 20 12 0 24 -228992
+-66577 0;
+#X obj 298 244 gemhead;
+#X obj 297 216 tgl 15 1 empty empty empty 0 -6 0 8 -262144 -1 -1 1
+1;
+#X obj 48 274 gemwin;
+#X msg 47 217 create \, 1;
+#X msg 61 244 destroy;
+#X obj 297 300 square;
+#X text 31 74 Gem operates on "render chains". Render chains define
+the flow and ordering of the rendering of graphics to the Gem world
+that you see in the [gemwin].;
+#X text 29 133 Every render chain must start with a [gemhead] \, or
+it will not be generated. Render chains generally end with an shape
+object (sometimes called a "geo").;
+#X connect 1 0 6 0;
+#X connect 2 0 1 0;
+#X connect 4 0 3 0;
+#X connect 5 0 3 0;