Initial .devcontainer config for codespaces #21

Job	Run time
Documentation	0s
Render README	0s
Validation	0s
Links / Validate Links	11s
Code Coverage / Get R version	4s
Check / (4.1)	1m 15s
Check / (4.2)	1m 16s
Lint / Get R version	3s
Man Pages / Get R version	2s
Check / (4.3)	1m 9s
Code Style / Get R version	1s
Man Pages / Roxygen	1m 15s
Code Style / Code Style	56s
Code Coverage / Test Coverage	1m 22s
Lint / Lint	58s
Code Coverage / Generate badge for coverage	6s
	8m 38s

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