create CHANGELOG.md and fill it with 1.7 notes

CHANGELOG.md

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+# ChangeLog for Scriptlets releases
+## Version 1.7
+### Added
+ Trusted scriptlets with extended capabilities. Full documentation [here](https://github.com/AdguardTeam/Scriptlets/blob/master/wiki/about-trusted-scriptlets.md).
+* trusted-click-element ([#23](https://github.com/AdguardTeam/Scriptlets/issues/23))
+* trusted-replace-xhr-response ([#202](https://github.com/AdguardTeam/Scriptlets/issues/202))
+* trusted-replace-fetch-response
+* trusted-set-local-storage-item
+* trusted-set-cookie
+Scriptlets:
+* xml-prune ([#249](https://github.com/AdguardTeam/Scriptlets/issues/249))
+### Improved
+Scriptlets:
+* prevent-element-src-loading ([#228](https://github.com/AdguardTeam/Scriptlets/issues/228))
+* prevent-fetch ([#216](https://github.com/AdguardTeam/Scriptlets/issues/216))
+* abort-on-stack-trace ([#201](https://github.com/AdguardTeam/Scriptlets/issues/201))
+* abort-current-inline-script ([#251](https://github.com/AdguardTeam/Scriptlets/issues/251))
+* set-cookie & set-cookie-reload
+Redirects:
+* google-ima3 ([#255](https://github.com/AdguardTeam/Scriptlets/issues/255))
+* metrika-yandex-tag ([#254](https://github.com/AdguardTeam/Scriptlets/issues/254))
+* googlesyndication-adsbygoogle ([#252](https://github.com/AdguardTeam/Scriptlets/issues/252))
+Miscellaneous:
+* Knowledge Base [debugging scriptlets article](https://kb.adguard.com/en/general/how-to-create-your-own-ad-filters#debug-scriptlets) has been improved