Add JOSS badge #1268

Job	Run time
Measure Test Coverage	4m 11s
Tests (clang++, test-native-regular)	27m 43s
Build Docker Image	8m 8s
Tests (clang++, test-native-fulldebug)	4m 59s
Paper Draft	36s
Tests (clang++, test-native-opt)	48m 33s
Test Tidy Enforcement on macOS	6m 38s
Tests (clang++, test-examples)	9m 19s
Web Tests	5m 45s
Tests (clang++, test-demos)	2m 51s
Enforce Tidyness	1m 22s
Tests (g++, test-native-regular)	36m 37s
Tests (g++, test-native-fulldebug)	36m 35s
Tests (g++, test-native-opt)	49m 46s
Tests (g++, test-examples)	9m 2s
Tests (g++, test-demos)	2m 55s
Test Documentation Build	14m 59s
Deploy Documentation Coverage	3s
Deploy to DockerHub	0s
	4h 30m 2s

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