Added readme

Author: Risto-Stevcev

README.md

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+# purescript-template-strings
+
+[![Latest release](http://img.shields.io/bower/v/purescript-template-strings.svg)](https://github.com/purescripters/purescript-template-strings/releases)
+
+Sample usage:
+
+```haskell
+> import Data.TemplateString.Unsafe ((<~>))
+> "Hello, ${firstName} ${lastName}!" <~> { firstName: "Haskell", lastName: "Curry" }
+"Hello, Haskell Curry!"
+
+> "The answer: ${answer}" <~> { answer: 42 }
+"The answer: 42"
+```
+
+```haskell
+> import Data.TemplateString ((<^>))
+> import Data.Tuple.Nested ((/\))
+> import Data.Show (show)
+> "Pi: ${pi}, Phi: ${phi}" <^> ["pi" /\ (show 3.1415), "phi" /\ (show 1.618)]
+"Pi: 3.1415, Phi: 1.618"
+```