Add initial, bare README.

Author: frewsxcv

README.md

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+# ksr-maybe
+
+This gem provides a `Maybe` type. The `Maybe` type represents an optional value:
+every `Maybe` is either `Just` and contains a value, or `Nothing`, and does not.
+
+## License
+
+Copyright Kickstarter, PBC.
+
+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.