Add CompressSave, with Chinese instructions in READMEs

CompressSave/LZ4Wrap/PeekableReader.cs

@@ -0,0 +1,17 @@
+using System.IO;
+
+namespace CompressSave.LZ4Wrap;
+
+class PeekableReader : BinaryReader
+{
+    LZ4DecompressionStream lzstream;
+    public PeekableReader(LZ4DecompressionStream input) : base (input)
+    {
+        lzstream = input;
+    }
+
+    public override int PeekChar()
+    {            
+        return lzstream.PeekByte();
+    }
+}