Update README

README.md

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 WIP
+
+NOTE to self and other: This probably isn't gonna work, 32bit fixed point has
+showed to be too low precision for a 3D physics engine (even though it is enough
+for 3D rendering). The issue is that we need to represent both very high and
+very low energies so we can allocate about 9 bits to the fractional part of the
+number, however this is too little to deal with slow rotations and low energies;
+it happens too often that for example objects balance on their edges because
+their energy gets quite small and rounded to zero. The project probably needs to
+be rewritten from scratch with more precision (still wouldn't use floating point
+but rather some tiny custon fixed point library).