benchmark with a graph

[yegor256]

Let's create a new GitHub Action workflow, which will (on every new tag):

• checkout the repo
• create a number of similar Rust CLI scripts in src/bin
• each script will do exactly the same manipulations with a map
• each script will use different implementations of the map (HashMap, Micromap, etc.)
• collect the performance results into a .csv file
• using gnuplot render a graph in SVG
• add the results summary and a graph to README.md
• submit a pull request

[yegor256]

@rultor release, tag is 0.0.6

[rultor]

@rultor release, tag is 0.0.6

@yegor256 OK, I will release it now. Please check the progress here

[rultor]

@rultor release, tag is 0.0.6

@yegor256 Done! FYI, the full log is here (took me 3min)