Add instructions for using Docker Compose #13

Job	Run time
3.7 CH=23.8.4.69	1m 1s
3.7 CH=22.5.1.2079	1m 2s
3.7 CH=19.3.5	53s
3.7 CH=18.14.9	55s
3.8 CH=23.8.4.69	34s
3.8 CH=22.5.1.2079	43s
3.8 CH=19.3.5	34s
3.8 CH=18.14.9	29s
3.9 CH=23.8.4.69	44s
3.9 CH=22.5.1.2079	37s
3.9 CH=19.3.5	35s
3.9 CH=18.14.9	34s
3.10 CH=23.8.4.69	35s
3.10 CH=22.5.1.2079	37s
3.10 CH=19.3.5	37s
3.10 CH=18.14.9	35s
3.11 CH=23.8.4.69	37s
3.11 CH=22.5.1.2079	36s
3.11 CH=19.3.5	35s
3.11 CH=18.14.9	30s
3.12 CH=23.8.4.69	59s
3.12 CH=22.5.1.2079	1m 3s
3.12 CH=19.3.5	49s
3.12 CH=18.14.9	1m 0s
Indicate completion to coveralls.io	8s
	17m 22s

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