Add README

README

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+
+patty AX.25 stack
+
+    patty (packet TTY multiplexer) is a portable implementation of the AX.25 2.2
+    standard, able to run in userland on many POSIX-like operating systems.  The
+    software uses the KISS TNC protocol to communicate with hardware.
+
+Features
+
+    * Full support for AX.25 2.2 stateful connections
+
+    * BSD sockets-like API for listening, accepting, establishing, and creating
+      connections
+
+    * Separate BSD sockets-like API for sending/receiving Unnumbered Information
+      (UI) datagrams
+
+    * Supports one separate program per SSID (up to 16) to accept inbound
+      connections
+
+    * Supports thousands of concurrent inbound and outbound stateful connections
+
+    * Able to multiplex a single KISS TNC to multiple software endpoints via
+      BSD pseudoterminals
+
+    * Allows APRS-IS connections to be used by software speaking the KISS TNC
+      protocol
+
+Building
+
+    $ ./configure
+    $ make
+    $ sudo make install
+
+Manual
+
+    Section 5 - Configuration file formats
+
+        pattyd.conf(5)  AX.25 daemon configuration file
+
+    Section 8 - System binaries
+
+        ax25dump(8)     dump AX.25 traffic
+        pattyd(8)       AX.25 userland stack daemon
+        tncd(8)         create a KISS TNC from an AX.25 interface
+