Run tests and publish snapshot to Maven on push

Add "for developers" section to README #121

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Run time

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Job	Run time
test_and_publish (forge)	2m 54s
test_and_publish (forge)	2m 37s
test_and_publish (forge)	1m 58s
test_and_publish (forge)	6m 25s
test_and_publish (fabric)	2m 42s
test_and_publish (fabric)	2m 56s
test_and_publish (fabric)	1m 14s
test_and_publish (fabric)	5m 37s
test_and_publish (common)	2m 47s
test_and_publish (common)	2m 47s
test_and_publish (common)	2m 6s
test_and_publish (common)	5m 54s
	39m 57s