feat: Add script.sh with tests

tests/files/bad_syntax.plan

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+sources= ('file:/home/user')
+targets=('file:/var/backup')

tests/files/empty_sources.plan

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+sources=()
+targets=('file:/var/backup')

tests/files/empty_targets.plan

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+sources=('file:/home/user')
+targets=()

tests/files/no_file_target.plan

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+sources=(file:///)
+targets=(ftp://user:pass@host/path)

tests/files/unsupported_source_scheme.plan

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+sources=('mongo:/user:password@localhost/database')
+targets=('file:/var/backup')

tests/files/unsupported_target_scheme.plan

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+sources=('file:/home/user')
+targets=(scp://user:pass@host/path)