feat: implement slider-joint

chore(roadmap): ipdate roadmap

feat(examples): add example of crankshaft mechanism to show the slide-joint

feat(examples): add slider joint example

fix(joints): fix slider joint

dev(research): add link mesh builder using gmsh

feat(research): init link fem analysis

docs: remove unused outputs

docs: update roadmap

ref(examples): useFlexia function for animation

feat(visualize): add basic visualization for 2d bodies and 2d hinges

feat: add makie to dipendancies

ci: remove task for julia 1.6

ci: add github workflows

feat(example): add animation for double pendulum

add matrix operations

update README.md

renames pkg main script

adds transformation matrices

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Initial commit