Add bridging explanation #1356

Job	Run time
setup-environment	8s
test-scarb-fmt	19s
test-various (season_test)	43m 26s
test-various (combat_test)	1h 29m 2s
test-various (owner_test)	9m 44s
test-various (position_test)	2m 59s
test-various (resources_test)	52m 33s
test-various (config_test)	10m 3s
test-various (hyperstructure_test)	43m 45s
test-various (bank_test)	48m 58s
test-various (map_test)	28m 35s
test-various (resource_bridge_test)	1h 22m 41s
test-various (trade_test)	1h 8m 30s
test-various (realm_test)	41m 36s
test-various (guild_test)	1h 14m 9s
test-various (transport_test)	14m 41s
test-various (test_ownership_systems)	10m 33s
	10h 21m 42s

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