Add 2.3.1-prelease notes

2.3.1-prelease notes.-.md

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+# Release Notes
+
+#### New Features
+- **Pinned Message Enhancements**:
+  - **Brightened Background Color**: Pinned messages now have a brighter background color for better visibility. (Commit: `4c2dd3e933`)
+
+- **Conversation Improvements**:
+  - **Account Indicator**: Added an account indicator near conversations for easier identification. (Commit: `d7d922c1d1`)
+  - **Group Chat Icon**: Group chats are now marked with an additional icon for clearer differentiation. (Commit: `f709e32805`)
+
+- **Reply Fallback**:
+  - **Improved Replies Fallback**: Enhanced the fallback mechanism for replies. (Commit: `9892ff8d77`)
+  - **Nickname in MUC Replies**: Added nickname into reply fallback specifically for Multi-User Chat (MUC). (Commit: `869182d640`)
+
+- **Contact Management**:
+  - **Contacts Tab**: The contacts tab now shows only contacts, improving clarity and organization. (Commit: `42d59adc78`)
+  - **Contact Status Widget**: Contact status is now displayed in a separate widget for better visibility. (Commit: `cf9d0c4f09`)
+
+#### Bug Fixes
+- **Fixed 'Hide Offline' Behavior**: Resolved issues with the 'Hide offline' feature to ensure it behaves as expected. (Commit: `2b2ecbb44e`)
+
+#### UI/UX Improvements
+- **Better Ellipsize for Subject Text**: Improved the ellipsis handling for subject text to enhance readability. (Commit: `cfdaaec86e`)