Added README

Author: mdX7

README.md

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+# ymir
+ymir is a sniffing tool ("sniffer") which captures traffic sent between wow servers and clients and writes it to a file. 
+
+## Disclaimer
+
+Use at your own risk, TrinityCore is not responsible for any actions caused (by Activision Blizzard, jurists or anyone else) due to usage of this tool.  
+The generated sniff files contain private data (e.g. your real name), so its highly advised to only share it with TrinityCore developers and official contributors.
+
+Since initial development during patch 8.1.5/Retail no known bans were caused so far. Nevertheless this is no proof for total security.
+
+## Operating system requirements
+The sniffer is developed for usage on Windows 10.  
+It might be possible to use it on OS X via. wine (untested)
+
+## Installation
+1. Download and install Npcap using Npcap installer from https://nmap.org/npcap/ (and install it in **WinPcap compatibility mode**)
+2. Download sniffer binary for your version, patch from [Releases](http://github.com/TrinityCore/ymir/releases) and save it anywhere (preferably not in wow directory)
+
+## How to sniff
+1. Delete Cache directory within your relevant wow installation (for retail e.g. inside *\_retail\_* directory)
+2. Start *ymir_retail.exe* (name might be different depending on wow branch, e.g. *ymir_ptr.exe* for PTR)
+3. Start wow client (via Battle.net or explorer)
+4. Sniffs will be saved in the dump/ subdirectory next to the sniffer while playing
+5. When done playing just close wow regularly and wait for the sniffer to close automatically (usually happens 1-5s after client is closed)
+6. Compress sniff in 7z, rar or zip, upload them to any file hoster (e.g. mega, zippyshare) and share the links [in the TC Forum](https://community.trinitycore.org/forum/13-wdbadbsniffs/), we're working on an easier solution for this already.
+
+## Tips
+You can combine step 1 & 2 with a batch file (adjust paths to your needs, especially partitions *E:* and *F:*):
+```batch
+E:
+cd E:\Games\World of Warcraft\_retail_\
+rmdir /S /Q Cache
+
+F:
+cd F:\ymir\Retail
+start ymir_retail.exe
+```
+
+## Sniff processing
+The saved sniffs may be further processed using [WowPacketParser](http://github.com/TrinityCore/WowPacketParser)
+
+## Authors
+- [shelby](http://github.com/Izidor)
+- [ModoX](http://github.com/mdX7)
+- [Shauren](http://github.com/Shauren)