Add READMEs for the repo and every generation, root CLAUDE.md and .gitattributes

The root README has the timeline of all generations since 2009. Each generation folder explains its hardware and what is in it. .gitattributes turns off line-ending conversion so all files stay as they were.

2012-simulation/README.md

@@ -0,0 +1,7 @@
+# 2012–2014: simulation on the PC
+
+- `ik-visualiser-vs/` – Visual Studio 2012 (C++, Win32 GDI) app that draws the leg inverse kinematics
+  (Oct–Nov 2012). The project file is still called `Catmull-Rom app.vcxproj`. A built `Debug/Hexapod app.exe` is included.
+- `processing-3d/` – Processing 2.2.1 3D simulator of the whole robot (October 2014): IK per leg (`FootClass`),
+  body rotation and translation (`HexapodClass`). Tags `processing-rar-1` … `processing-rar-4` are the four
+  archived versions. Its classes were later ported to Arduino, see `../2016-ssc32-processing-port/`.