docs: adds feature table in README #225

Job	Run time
noetic mj-3.2.0 GLFW + catkin_lint + ccov	12m 44s
noetic mj-3.2.0 GLFW + catkin_lint + ccov	12m 44s
noetic mj-3.2.0 GLFW + catkin_lint + ccov	7m 21s
noetic mj-3.2.0 OSMESA + catkin_lint + ccov	8m 20s
noetic mj-3.2.0 OSMESA + catkin_lint + ccov	8m 20s
noetic mj-3.2.0 OSMESA + catkin_lint + ccov	8m 20s
noetic mj-3.2.0 EGL + catkin_lint + ccov	8m 56s
noetic mj-3.2.0 EGL + catkin_lint + ccov	8m 56s
noetic mj-3.2.0 EGL + catkin_lint + ccov	8m 56s
noetic mj-3.2.0 DISABLE + catkin_lint + ccov	8m 38s
noetic mj-3.2.0 DISABLE + catkin_lint + ccov	8m 38s
noetic mj-3.2.0 DISABLE + catkin_lint + ccov	8m 38s
one mj-3.2.0 GLFW + clang-tidy (delta)	4m 43s
one mj-3.2.0 GLFW + clang-tidy (delta)	4m 43s
one mj-3.2.0 GLFW + clang-tidy (delta)	4m 43s
one mj-3.2.0 OSMESA + clang-tidy (delta)	8m 53s
one mj-3.2.0 OSMESA + clang-tidy (delta)	8m 6s
one mj-3.2.0 OSMESA + clang-tidy (delta)	8m 6s
one mj-3.2.0 EGL + clang-tidy (delta)	5m 47s
one mj-3.2.0 EGL + clang-tidy (delta)	5m 47s
one mj-3.2.0 EGL + clang-tidy (delta)	5m 47s
one mj-3.2.0 DISABLE + clang-tidy (delta)	4m 28s
one mj-3.2.0 DISABLE + clang-tidy (delta)	4m 28s
one mj-3.2.0 DISABLE + clang-tidy (delta)	4m 28s
	3h 0m 30s

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