Create README.md for HealerProtection addon

Add detailed README for HealerProtection addon.

README.md

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+# 🩺 HealerProtection
+
+A lightweight healer alert addon for **Octo WoW / Vanilla WoW 1.12.1**.
+
+HealerProtection automatically warns your group when you are:
+
+* 💧 Running low on mana
+* 🫗 Out of mana
+* ❤️ Close to death
+* 💀 Dead
+* 👹 Taking aggro
+
+The addon was adapted and optimized specifically for the **Vanilla 1.12.1 client used by Octo WoW**.
+
+## ✨ Features
+
+* 💧 Low Mana warning
+* 🫗 Out of Mana warning
+* ❤️ Near Death warning
+* 💀 Death notification
+* 👹 Aggro warning
+* 💬 Optional chat messages
+* 🎭 Optional emotes
+* 🎚️ Configurable mana and health thresholds
+* 📢 Configurable announcement channel
+* 👀 Optional Line of Sight warning
+* 🌍 Optional announcements outside instances
+* ⚔️ Battleground filtering
+* 🛡️ Raid filtering
+* ✏️ Custom message prefix and suffix
+
+Open the settings panel with:
+
+```text
+/hp
+```
+
+or:
+
+```text
+/healerprotection
+```
+
+## 🐙 Octo WoW Compatibility
+
+HealerProtection is designed for:
+
+```text
+World of Warcraft 1.12.1
+Octo WoW
+```
+
+The addon does **not require** ClassicAPI, SuperWoW or Nampower.
+
+If additional APIs such as `UnitThreatSituation()` are available through the client or another extension, HealerProtection can automatically use them to improve aggro detection.
+
+## 👹 Aggro Detection
+
+Vanilla WoW does not provide the same threat API available in modern versions of the game.
+
+HealerProtection therefore uses several methods:
+
+* `UnitThreatSituation()` when available
+* Your current hostile target
+* The hostile targets selected by party members
+* The hostile targets selected by raid members
+
+This improves aggro detection while keeping the addon compatible with the Vanilla 1.12.1 client.
+
+## ⚡ Performance
+
+HealerProtection is designed to be extremely lightweight.
+
+Mana, health and death monitoring are **event-driven**, which means the addon only reacts when the relevant game state changes.
+
+Aggro detection uses a small periodic check because Vanilla does not provide a reliable native threat event.
+
+When Aggro alerts are disabled, the aggro check is effectively skipped.
+
+## 📦 Installation
+
+1. Download the addon.
+2. Extract the archive.
+3. Place the `HealerProtection` folder inside:
+
+```text
+World of Warcraft\Interface\AddOns\
+```
+
+Your folder structure should look like:
+
+```text
+Interface
+└── AddOns
+    └── HealerProtection
+        ├── HealerProtection.toc
+        └── core.lua
+```
+
+4. Restart the game.
+5. Enable **HealerProtection** in the AddOns menu.
+6. Type `/hp` to configure the addon.
+
+## ⚙️ Default Settings
+
+```text
+Out of Mana: Enabled
+OOM threshold: 10%
+
+Low Mana: Enabled
+Low Mana threshold: 30%
+
+Near Death: Enabled
+Near Death threshold: 30%
+
+Death message: Enabled
+
+Aggro warning: Disabled
+
+Show in raids: Enabled
+Show outside instances: Disabled
+Show in battlegrounds: Disabled
+
+Announcement channel: AUTO
+```
+
+`AUTO` automatically selects the most appropriate group channel:
+
+```text
+PARTY → while in a party
+RAID  → while in a raid
+```
+
+The addon will not attempt to send invalid PARTY, RAID or GUILD messages when the corresponding channel is unavailable.
+
+## 🔇 Anti-Spam
+
+Mana and health alerts include a reset margin.
+
+For example, after triggering a Low Mana warning, your mana must recover above the configured threshold before the warning can trigger again.
+
+This prevents repeated messages when your mana or health constantly moves around the alert threshold.
+
+## 🆕 Version 1.1
+
+### Improvements
+
+* ❤️ Restored the Near Death alert
+* 🎚️ Added configurable Near Death threshold
+* 👹 Improved aggro detection
+* 👥 Added party and raid target scanning
+* ⚡ Converted mana and health monitoring to event-driven checks
+* 🧹 Reduced unnecessary polling
+* 🔇 Added anti-spam logic for mana and health alerts
+* 💬 Centralized chat channel validation
+* 🐙 Improved Octo WoW / Vanilla 1.12.1 compatibility
+* 🔓 Removed unnecessary `InCombatLockdown()` dependency
+* 🧽 Removed obsolete setup and bootstrap code
+* 🗑️ Removed obsolete `SETOOMP` handling
+* 🔌 Removed unnecessary ClassicAPI, SuperWoW and Nampower dependencies
+* 👀 Added Line of Sight warning to the settings menu
+* 🧠 Improved Lua 5.0 / Vanilla event compatibility
+* 💾 Preserved compatibility with existing `HPTABPC` saved variables
+
+## ⌨️ Commands
+
+```text
+/hp
+/healerprotection
+```
+
+Both commands open or close the configuration window.
+
+## 💾 Saved Variables
+
+Settings are stored per character using:
+
+```text
+HPTABPC
+```
+
+Existing settings from older versions are preserved whenever possible.
+
+## 👤 Author
+
+HealerProtection is maintained by **Dusk92** and adapted for the **Octo WoW / Vanilla 1.12.1** environment.
+
+## 🐛 Bug Reports
+
+If you encounter a bug or unexpected behavior on Octo WoW, feel free to open an issue on GitHub.
+
+Please include:
+
+* 📝 What happened
+* 🎯 What you expected to happen
+* ⚙️ Your enabled HealerProtection settings
+* 🔌 Whether you use SuperWoW / ClassicAPI
+* ❗ Any Lua error message you received