add readme for each package

README.md

@@ -0,0 +1,34 @@
+# Go Hash
+
+Simple wrapper functions which take arbitrary string input and return string hashes in hex encoding.
+
+The author is aware that this package is somewhat perfunctory, but likes not having to think about the `crypto` packages.
+
+## Example
+
+```go
+package main
+
+import (
+	"errors"
+	"fmt"
+	"os"
+
+	"github.com/annybs/go/hash"
+)
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Println(errors.New("input required"))
+		os.Exit(1)
+	}
+
+	fmt.Println(hash.SHA256(os.Args[1]))
+}
+```
+
+Execute `go run main.go "any test string you like"` to create SHA256 output.
+
+## License
+
+See [LICENSE.md](../LICENSE.md)