Added README

README.md

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+```
+package main
+
+import (
+    // External
+    werr "git.gibonuddevalla.se/go/wrappederror"
+
+    // Standard
+    "errors"
+    "fmt"
+)
+
+func errorHandler(err werr.Error) {
+    // For example print or log error to file
+    fmt.Printf("ERROR - %s\n", err)
+}
+
+func foo() {
+    werr.SetLogCallback(errorHandler)
+
+    err := errors.New("foobar 1")
+    err1 := werr.Wrap(err)
+
+    err2 := werr.New("foobar 2")
+}
+```

go.mod

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+module git.gibonuddevalla.se/go/wrappederror
+
+go 1.21