Create README.md

README.md

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+# sv_a2s_fix
+
+Yesterday, Valve has broke old master servers, so GMod 9 players can't see other servers with sv_master_legacy_mode 1, 
+but sv_master_legacy_mode 0 is broken too. The bug happends when server with sv_master_legacy_mode 0 sends A2S_INFO to
+client, the Protocol Version is 17, but GMod 9 and Source Engine 2006 runs Protocol Version 7, so this plugin replaces
+Protocol Version and (!) calls lua callback to let you change the server info (like server name, map name, gamemode
+or even version).
+
+## Lua callbacks
+```
+function onServerQuery(info,addr)
+  return info
+end
+```
+
+The ```info``` is a table that holds original server information (you can see full list of fields via tprint),
+
+To sends changed info, just return table. If don't want send anything, return nil.
+The ```addr``` is just ip of a client
+
+```
+function onClientResponse(addr,req)
+	return true
+end
+```
+
+This callback called when server tried to respond for connectionless packet. The ```req``` holds ID of a packet,
+(for example 0x49 for A2S_INFO)
+
+Return true to allow response send, false to block.