initial commit with a String extension

.gitignore

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+.build

Package.swift

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+import PackageDescription
+
+let package = Package(
+    name: "Batteries"
+)

Sources/String.swift

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+import Foundation
+
+public extension String {
+
+    func contains(substring: String) -> Bool {
+        return rangeOfString(substring) != nil
+    }
+
+    func trim() -> String {
+        return stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())
+    }
+
+}