added comments for some functions

Author: shikhart98

Compression/src/HEncoder.java

@@ -4,8 +4,8 @@
 
 public class HEncoder {
 
-	public HashMap<Character, String> encoder = new HashMap<>();
-	public HashMap<String, Character> decoder = new HashMap<>();
+	public HashMap<Character, String> encoder = new HashMap<>(); // in order to encode
+	public HashMap<String, Character> decoder = new HashMap<>(); // in order to decode
 
 	private static class Node {
 
@@ -81,14 +81,17 @@ private void traverse(Node node, String osf) {
 
 	}
 
+	// compression work done here
 	public String compress(String str) {
 		String rv = "";
 		for (int i = 0; i < str.length(); ++i) {
 			rv += encoder.get(str.charAt(i));
 		}
 		return rv;
 	}
+	
 
+	//in order to decompress
 	public String decompress(String str) {
 		String s = "";
 		String code = "";