Add changelog, license and readme

CHANGELOG.md

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+# Changelog
+
+## v0.1.0 (unreleased)
+
+* First version

LICENSE

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+MIT License Copyright (c) 2021 Bruno Carlin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell c
+pies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# go/cache
+
+Cache provides an in-memory key-value store used to cache arbitrary data.
+
+It supports entry expiration.
+
+## Quickstart
+
+You can add `cache` to your project using `go get`:
+
+  go get code.bcarlin.xyz/go/cache
+  
+You can then import it in your code:
+
+  import "code.bcarlin.xyz/go/cache"
+
+## Tests
+
+To run the tests, run the command:
+
+  go test
+  
+## Usage
+
+The API is very light and straight forward:
+
+```go
+// Initialize a cache
+c := cache.New()
+
+// Store some values. Keys must be strings.
+c.Put("foo", "my data")
+c.Put("the-answer", 42)
+
+// Store some more data with an ewpiration date
+c.PutTTL("not-the-answer", 144, 1*time.Hour)
+
+// Retrieve some data
+val, ok := c.Get("the-answer")
+if !ok {
+  fmt.Println("cache missed")
+}
+
+// Delete entries
+c.Del("foo")
+c.Del("does-not-exist") // does not fail
+```
+
+## License
+
+[MIT](https://choosealicense.com/licenses/mit/)