feat: add source creation message

[djangoliv]

closes #1165

[github-actions]

Jest Coverage Comment

Summary

Lines	Statements	Branches	Functions
	76.4% (476/623)	73.91% (187/253)	81.81% (99/121)

Coverage Report (76%)

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
All files	76.4	73.91	81.81	76.28
config.js	100	96.55	100	100	4
profiles.js	94.56	97.05	94.73	95.23	133, 161–163
sources.js	62.99	54.76	75	62.69	36, 64, 93, 143, 147, 150, 173, 219–229, 238–252, 260–270, 279–293
tools.js	41.08	21.95	55.55	41.26	85–86, 123–130, 142–174, 187–206, 231–238, 255, 265–269, 285, 297–352
userData.js	81.57	64	100	81.33	35, 43, 50, 71–72, 85–86, 99–100, 111, 118–119, 127–128
users.js	95.9	96.87	95	96.61	239–240, 261–262
utils.js	100	88.88	100	100	16, 42