add badge to the report page

See #25, release log:

• b730f30 by @yegor256: #25 quotes
• 9f68dc7 by @yegor256: #25 badge is there
• 263e516 by @yegor256: #1 \n
• 9a92265 by @yegor256: typo
• 79edc94 by @yegor256: show XSD messages
• a78abf7 by @yegor256: typo again
• d8f7475 by @yegor256: typo
• bcebcb3 by @yegor256: custom error page
• c1191b0 by @yegor256: SafeStorage always

Released by Rultor 2.0-SNAPSHOT, see build log