Added legal disclaimers

LEGAL.txt

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+The information and materials available through this repo (collectively, “Materials”)
+are available on an “AS 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.
+
+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.