Create SECURITY.md

Author: hknokh

SECURITY.md

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+## Security
+
+Please report any security issue to [security@salesforce.com](mailto:security@salesforce.com)
+as soon as it is discovered. This library limits its runtime dependencies in
+order to reduce the total cost of ownership as much as can be, but all consumers
+should remain vigilant and have their security stakeholders review all third-party
+products (3PP) like this one and their dependencies.