Add file-level summaries to frequently modified files

pkts-core/src/main/java/io/pkts/framer/FramingException.java

@@ -2,6 +2,14 @@
 
 import io.pkts.protocol.Protocol;
 
+/**
+* A custom runtime exception specifically designed for handling protocol framing errors in the Pkts networking library. 
+* The FramingException captures both an error message and the associated Protocol, providing detailed context for network protocol framing issues. 
+* It extends RuntimeException and includes a constructor that takes a message and protocol, with a getter method 
+* to retrieve the specific protocol where the framing error occurred. This exception enhances error handling and 
+* debugging by allowing developers to precisely identify and diagnose protocol-level framing problems during network packet processing.
+*/
+
 public class FramingException extends RuntimeException {
   private final Protocol protocol;
 

pkts-sip/src/main/java/io/pkts/packet/sip/header/impl/ExpiresHeaderImpl.java

@@ -3,6 +3,14 @@
 import io.pkts.buffer.Buffers;
 import io.pkts.packet.sip.header.ExpiresHeader;
 
+/** 
+* ExpiresHeaderImpl is a specialized SIP header implementation for managing session expiration times in network communication. 
+* It extends SipHeaderImpl and implements the ExpiresHeader interface, providing a concrete mechanism to store and retrieve expiration values for SIP sessions. 
+* The class offers methods to create, access, and clone expiration headers, with a core focus on representing the integer-based expires time for SIP communication protocols. 
+* It supports basic header manipulation by storing an expires value and allowing retrieval and duplication of that value, 
+* facilitating session timeout and lifecycle management in SIP-based network interactions."
+ */
+
 public class ExpiresHeaderImpl extends SipHeaderImpl implements ExpiresHeader {
 
     private int expires;