Added legal disclaimers

LEGAL.txt

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+The information and materials available through this repo (collectively, “Materials”) are available on an “AI IS” basis without warranties of any kind, either express or implied, including, but not limited to, warranties of merchantability, title, fitness for a particular purpose and non-infringement. You assume all risks associated with using the Materials, and digital assets and decentralized systems generally, including but not limited to, that: (a) digital assets are highly volatile; (b) using digital assets is inherently risky due to both features of such assets and the potential unauthorized acts of third parties; (c) you may not have ready access to digital assets; and (d) there is a risk of losing your digital assets or those owned by a third party. You agree that you will have no recourse against anyone else for any losses due to the use of the Materials. For example, these losses may arise from or relate to: (i) incorrect information; (ii) software or network failures; (iii) corrupted files; (iv) unauthorized access; (v) errors, mistakes, or inaccuracies; or (vi) third-party activities.
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+You are solely responsible for using the Materials in compliance with applicable laws and regulations, including but not limited to, export control or sanctions laws of any applicable jurisdiction. You should be aware that U.S. export control and sanctions laws prohibit U.S. persons (and other persons that are subject to such laws) from transacting with persons in certain countries and territories or that are on the Specially Designated Nationals list. Accordingly, you must avoid providing the Materials to sanctioned persons because such activity could be a violation of U.S. export controls and sanctions law.