Add a changelog file.

changelog.md

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+# SrcDS NX Changelog
+
+### 1.0.0 (22 December 2017)
+- Initial release
+- Notable changes and improvements over [srcds_osx](https://github.com/TheDS/srcds_osx):
+  * Automatic updating of srcds binaries on server startup. This can be disabled by adding
+    the `-noupdate` option to the command line. Please note that you still have to keep
+    the game up to date using SteamCMD or the Steam client GUI.
+  * Automatic downloading and updating of Steam libraries. This means the Steam client GUI
+    is no longer required to set up a server; SteamCMD will suffice. This can be disabled
+    by adding the `-nosteamupdate` option to the command line.
+  * Added `-steambeta` command line option to switch to the beta branch for Steam
+    libraries.
+  * Added support for the 64-bit version of Day of Infamy. This version is run by default
+    unless you add the `-32` option to the command line.
+  * Fixed support for Garry's Mod. The game update on December 18th broke things.
+  * Fixed issue where the status command on CS:GO, Insurgency, and Day of Infamy did not
+    display the current map.