Adding LICENSE and SECURITY documentation (#22)

LICENSE.md

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+Apache-2.0 License
+
+Copyright 2024 Coinbase
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

SECURITY.md

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+# Security Policy
+
+The Coinbase team takes security seriously. Please do not file a public ticket discussing a potential vulnerability.
+
+Please report your findings through our [HackerOne][1] program.
+
+[1]: https://hackerone.com/coinbase