Updates to Defining an Environment

[mfogelson]

Updated code and documentation for Defining an Environment example.

This included adding necessary packages, defining variables and consistent variable names.

Now ant environment example works by blindly copy and pasting all lines to new julia script.

[codecov-commenter]

Codecov Report

Merging #60 (f08c819) into main (2b98c76) will decrease coverage by 39.55%. The diff coverage is n/a.

:exclamation: Current head f08c819 differs from pull request most recent head ea0952f. Consider uploading reports for the commit ea0952f to get more accurate results

@@             Coverage Diff             @@
##             main      #60       +/-   ##
===========================================
- Coverage   87.67%   48.12%   -39.56%     
===========================================
  Files          94       94               
  Lines        4966     4958        -8     
===========================================
- Hits         4354     2386     -1968     
- Misses        612     2572     +1960     

Impacted Files	Coverage Δ
src/solver/options.jl	0.00% <0.00%> (-100.00%)	:arrow_down:
src/contacts/linear.jl	0.00% <0.00%> (-100.00%)	:arrow_down:
src/mechanics/energy.jl	0.00% <0.00%> (-100.00%)	:arrow_down:
src/mechanics/momentum.jl	0.00% <0.00%> (-100.00%)	:arrow_down:
src/graph/linear_system.jl	0.00% <0.00%> (-100.00%)	:arrow_down:
src/simulation/simulate.jl	0.00% <0.00%> (-100.00%)	:arrow_down:
src/contacts/collisions/string.jl	0.00% <0.00%> (-100.00%)	:arrow_down:
src/joints/rotational/impulses.jl	0.00% <0.00%> (-100.00%)	:arrow_down:
src/gradients/finite_difference.jl	0.00% <0.00%> (-100.00%)	:arrow_down:
src/joints/translational/impulses.jl	0.00% <0.00%> (-100.00%)	:arrow_down:
... and 58 more

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