Add string library file.

dm_lib/std/core/string.dm

@@ -0,0 +1,26 @@
+ns std::core
+
+pub int String {
+    bytes: byte[]
+    encoding: Encoding
+    length: Int
+}
+
+pub enum Encoding {
+    Utf8, Utf16, Ascii
+}
+
+pub impl Utf8String(bytes: byte[]) : String {
+    impl fn get_encoding() = Encoding::Utf8
+    impl fn get_length() = bytes.length
+}
+
+pub mod string {
+
+    // Example usage:
+    // let bytes = [0x64, 0x65, 0x69, 0x6d, 0x6f, 0x73]
+    // let s = string::from_utf8_bytes(bytes)
+    // println s // "deimos"
+    fn from_utf8_bytes(bytes: byte[]): String = Utf8String(bytes)
+
+}