Create README.md

Author: adriaanm

README.md

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+scala-xml
+=========
+
+The standard Scala XML library.
+
+As of Scala 2.11, this library is a separate jar that can be omitted from Scala projects that do not use XML.
+We're also looking forward to alternative implementations!
+
+## Adding an SBT dependency
+To depend on scala-xml in SBT, add something like this to your build.sbt:
+
+```
+libraryDependencies += "org.scala-lang" %% "scala-xml" % "1.0-RC1"
+```
+
+(Assuming you're using a `scalaVersion` for which a scala-xml is published.
+The first 2.11 milestone for which this is true is 2.11.0-M4.)
+
+To support multiple Scala versions:
+
+  - SBT 0.12:
+```
+libraryDependencies <++= (scalaVersion) { sVer =>
+  if (sVer startsWith "2.11") Seq("org.scala-lang" %% "scala-xml" % "1.0-RC1")
+  else Seq.empty
+}
+```
+
+  - SBT 0.13:
+```
+libraryDependencies ++= (
+  if (scalaVersion.value startsWith "2.11") Seq("org.scala-lang" %% "scala-xml" % "1.0-RC1")
+  else Seq.empty
+)
+```