Add initial readme

README.md

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+# JWICE
+
+Jwice is a small and incomplete library for creating jws signatures. 
+The main purpose of this library is to explore the logic behind creating these signatures and use it in
+the [Demogog](https://github.com/alxandru-ionut-balan/demogog) application.
+
+## Usage
+
+You can either use the default header and change from there or create a new protected header from
+scratch.
+
+To use the default just do:
+
+```go
+protectedHeader := jws.DefaultJwsProtectedHeader()
+```
+
+The default header has the following properties set:
+
+```go
+JwsProtectedHeader{
+	B64:  false,
+	Crit: []string{"sigT", "sigD", "b64"},
+	Alg:  "RS256",
+	SigT: time.Now().In(time.UTC).Format(time.RFC3339),
+	SigD: SignedHeaders{
+		Pars: []string{"(request-target)", "digest"},
+		MId:  "http://uri.etsi.org/19182/HttpHeaders",
+	},
+}
+
+```