Add glue tut.

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docs/glue_tut.md

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+# Gluing together animations
+
+Reanimate is a library for programmatically generating animations with a twist
+towards mathematics / vector drawings. A lot of inspiration was drawn from
+3b1b's manim library.
+
+
+
+## Scalable Vector Graphics
+
+SVG images are the primitive building blocks in Reanimate. They are the universal
+image format used to glue together animations.
+
+TODO: Add advanced SVG features: blurs, blobs, etc.
+
+<details>
+  <summary>Toggle source code.</summary>
+  <pre><code class="haskell">
+  {!examples/tut_glue_svg.hs!}
+  </code></pre>
+</details>
+<br/>
+<video width="640" height="360" autoplay loop>
+  <source src="https://github.com/Lemmih/reanimate/raw/master/docs/rendered/tut_glue_svg.mp4">
+  <source src="../rendered/tut_glue_svg.mp4">
+</video>
+
+## Animation = Time 🡢 SVG
+
+<details>
+  <summary>Toggle source code.</summary>
+  <pre><code class="haskell">
+  {!examples/tut_glue_animate.hs!}
+  </code></pre>
+</details>
+<br/>
+<video width="640" height="360" autoplay loop>
+  <source src="https://github.com/Lemmih/reanimate/raw/master/docs/rendered/tut_glue_animate.mp4">
+  <source src="../rendered/tut_glue_animate.mp4">
+</video>
+
+## Pillar I: Haskell
+
+TODO: Write about fourier drawings. About how advanced math is doable with Haskell.
+
+## Pillar II: Libraries
+
+TODO: Write about how lots of libraries are available for Haskell. Use chiphunk
+      as an example. Show SVG primitives with 2D physics.
+
+## Pillar III: LaTeX
+
+TODO: Show that LaTeX is a provider of SVG graphics. It has the type
+      'latex :: Text -> SVG'. Caching is automatic and it plays well with
+      other SVG functions (partialSvg, center, etc).
+
+## Pillar IV: potrace
+
+## Pillar V: Povray
+
+## Pillar VI: Blender