Added readme

README.md

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+h1. Enumer
+
+Enumer generates Go code to get string names from enum values and viceversa.
+It is a fork of [Rob Pike’s Stringer tool](https://godoc.org/golang.org/x/tools/cmd/stringer) 
+but adding a *"string to enum value"* method to the generated code.
+
+For example, if we have an enum type called `Pill`, executing `enumer -type=Pill` will generate two methods:
+
+```
+func (i Pill) String() string {
+    //...
+}
+
+func PillString(s string) (Pill, error) {
+    //...
+}
+```
+
+For more information on how to use, please go to the [Stringer docs](https://godoc.org/golang.org/x/tools/cmd/stringer)