Add comprehensive antivirus false positive documentation

Co-authored-by: chipitsine <2217296+chipitsine@users.noreply.github.com>

WINDOWS_README.txt

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+================================================================================
+SoftEther VPN - Windows Installation Notes
+================================================================================
+
+Thank you for installing SoftEther VPN!
+
+SoftEther VPN is legitimate, open-source VPN software developed by researchers
+at the University of Tsukuba, Japan. It has been in active development since
+2013 and is used by organizations and individuals worldwide.
+
+================================================================================
+IMPORTANT: Antivirus False Positive Warning
+================================================================================
+
+Some antivirus software (including Microsoft Defender) may incorrectly flag
+SoftEther VPN executables as malicious. This is a FALSE POSITIVE detection.
+
+WHY THIS HAPPENS:
+-----------------
+VPN software performs operations that can appear suspicious to antivirus
+programs:
+  - Network tunneling and traffic interception
+  - Low-level network operations
+  - Service installation with elevated privileges
+  - Registry modifications for Windows integration
+
+These are NORMAL and NECESSARY operations for any VPN software.
+
+IF MICROSOFT DEFENDER QUARANTINES SOFTETHER VPN:
+------------------------------------------------
+
+1. Add Exclusions to Microsoft Defender:
+   
+   a) Open Windows Security (Windows Key + I -> Privacy & Security -> 
+      Windows Security -> Virus & threat protection)
+   
+   b) Click "Manage settings" under Virus & threat protection settings
+   
+   c) Scroll down to "Exclusions" and click "Add or remove exclusions"
+   
+   d) Click "Add an exclusion" -> "Folder" and add:
+      
+      C:\Program Files\SoftEther VPN Client
+      C:\Program Files\SoftEther VPN Client Developer Edition
+      C:\Program Files\SoftEther VPN Server
+      C:\Program Files\SoftEther VPN Server Developer Edition
+      
+      (Add only the folders that exist for your installation)
+
+2. Restore Quarantined Files:
+   
+   a) Go to "Virus & threat protection" -> "Protection history"
+   b) Find quarantined SoftEther VPN files
+   c) Click "Actions" -> "Restore"
+
+3. Reinstall if Necessary:
+   
+   If files were deleted, reinstall SoftEther VPN. The exclusions will
+   prevent future detections.
+
+REPORT FALSE POSITIVE TO MICROSOFT:
+------------------------------------
+
+Help improve Microsoft Defender by reporting the false positive:
+
+  Visit: https://www.microsoft.com/en-us/wdsi/filesubmission
+  
+  Submit the flagged file and indicate it's a false positive detection
+  of SoftEther VPN, open-source software from the University of Tsukuba.
+
+MORE INFORMATION:
+-----------------
+
+For detailed documentation about this issue and additional solutions, see:
+
+  https://github.com/SoftEtherVPN/SoftEtherVPN/blob/master/ANTIVIRUS.md
+
+VERIFY AUTHENTICITY:
+--------------------
+
+SoftEther VPN is open source. You can verify the software by:
+
+  - Reviewing source code: https://github.com/SoftEtherVPN/SoftEtherVPN
+  - Official website: https://www.softether.org/
+  - Only download from official sources
+
+WARNING: Do not download SoftEther VPN from third-party websites.
+
+================================================================================
+Getting Started
+================================================================================
+
+After adding antivirus exclusions (if needed):
+
+1. Launch "SoftEther VPN Client Manager" from the Start Menu
+2. Configure your VPN connection settings
+3. Connect to your VPN server
+
+For detailed documentation, visit: https://www.softether.org/
+
+================================================================================
+Support
+================================================================================
+
+Official Website: https://www.softether.org/
+GitHub Repository: https://github.com/SoftEtherVPN/SoftEtherVPN
+Security Issues: https://github.com/SoftEtherVPN/SoftEtherVPN/security
+
+================================================================================
+
+SoftEther VPN is licensed under the Apache License 2.0
+Copyright (c) SoftEther VPN Project at University of Tsukuba, Japan
+
+Thank you for using SoftEther VPN!
+
+================================================================================