Add release for v1.2.0

Author: TempoTian

RELEASE_v1.2.md

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+# ESP WebRTC Solution v1.2 Release Notes
+
+## Overview
+
+ESP WebRTC Solution v1.2 is a significant update that brings enhanced stability, new features, expanded hardware support, and improved developer experience. This release includes major component updates, critical bug fixes.
+
+## What's New
+
+### 1️⃣ Peer Connection Enhancements
+
+**esp_peer updated to v1.2.7**
+
+**New Features:**
+- ✔️ Support for multiple data channels
+- ✔️ Support for Forward-TSN (Transmission Sequence Number)
+- ✔️ Support for ESP32-C5 microcontroller
+
+**Bug Fixes:**
+- ✔️ Fixed stability issues under poor network conditions
+- ✔️ Fixed potential crash caused by race conditions
+- ✔️ Fixed DTLS role mismatch issue
+- ✔️ Added msid attribute in SDP for better stream identification
+- ✔️ Fixed TURN relay connectivity issues
+
+### 2️⃣ New Capture System – GMF-based [esp_capture](https://github.com/espressif/esp-gmf/tree/main/packages/esp_capture)
+
+The legacy capture system has been replaced with a GMF (Generic Media Framework) implementation, providing significant extensibility improvements:
+
+- Support for multiple capture paths
+- Automatic capability negotiation to simplify configuration
+- Enhanced pipeline flexibility for multimedia processing
+
+### 3️⃣ Published Components to ESP-IDF Registry
+
+Now available as independent, reusable components:
+- [esp_peer](https://components.espressif.com/components/espressif/esp_peer)
+- [esp_capture](https://components.espressif.com/components/espressif/esp_capture)
+- [av_render](https://components.espressif.com/components/tempotian/av_render)
+- [media_lib_sal](https://components.espressif.com/components/tempotian/media_lib_sal)
+- [codec_board](https://components.espressif.com/components/tempotian/codec_board)
+
+### 4️⃣ Solution Updates
+
+**New Solution:**
+- Added [kms_demo](https://github.com/espressif/esp-webrtc-solution/tree/main/solutions/kms_demo) for Kurento Media Server Publisher
+
+**Improvements:**
+- Added AI processing (Pedestrian Detection) to doorbell_local demo
+- Fixed OpenAI demo function call build error
+
+### 5️⃣ Other Features and Improvements
+
+- HTTP client refined: supports redirect and OPTIONS requests
+- Added SEI injection support via video send hook – thanks to [Todd Sharp](https://github.com/recursivecodes)
+- Fixed WHIP signaling issue when ICE server not configured
+- Added bitrate setting control for esp_webrtc
+- Fixed crash issue when resetting while renderer is created
+- Fixed data queue read/write dead-loop issue
+- Fixed codec board pin configuration issue
+
+**🆕 New board supports:**
+- ESP32P4-EYE
+- XIAO ESP32S3 Sense
+
+## Migration Guide — Upgrading to v1.2.0
+
+This release introduces the GMF-based Capture System, which replaces the old esp_capture APIs. To upgrade smoothly, please review the following compatibility changes:
+
+For detailed changes, please refer to commit [0ad48d](https://github.com/espressif/esp-webrtc-solution/commit/0ad48d537082f9c24d4fc228863b6138e3e78417#diff-038ca219eec1eb427e8b0296bdcfbbc0f8af70e89d380763e60f7ce313f9bf70).
+
+Users only need to update `media_sys.c` and replace the relevant APIs or configurations as shown in the table below.
+
+### Capture System API Changes
+
+| Legacy API (Simple Capture)      | New API (GMF Capture)           | Notes   |
+|-----------------------------------|---------------------------------|---------|
+| esp_capture_audio_codec_src_cfg_t | esp_capture_audio_dev_src_cfg_t | Renamed |
+| esp_capture_new_audio_codec_src   | esp_capture_new_audio_dev_src   | Renamed |
+| ESP_CAPTURE_CODEC_TYPE_*          | ESP_CAPTURE_FMT_ID_*            | Renamed |
+| esp_capture_path_handle_t         | esp_capture_sink_handle_t       | Renamed |
+| esp_capture_setup_path            | esp_capture_sink_setup          | Renamed |
+| esp_capture_enable_path           | esp_capture_sink_enable         | Renamed |
+| esp_capture_acquire_path_frame    | esp_capture_sink_acquire_frame  | Renamed |
+| esp_capture_release_path_frame    | esp_capture_sink_release_frame  | Renamed |
+
+## Obtaining v1.2.0
+
+Users can obtain the release code using either of the following methods:
+
+### Method 1: Using Git (Recommended)
+
+```bash
+git clone -b v1.2.0 https://github.com/espressif/esp-webrtc-solution.git esp-webrtc-solution-v1.2.0
+cd esp-webrtc-solution-v1.2.0/
+```
+
+This is the recommended method for obtaining v1.2.0 of ESP WebRTC Solution.
+
+### Method 2: Download Archive
+
+Alternatively, you can download the release archive directly from GitHub:
+[esp-webrtc-solution-v1.2.0.zip](https://github.com/espressif/esp-webrtc-solution/archive/refs/tags/v1.2.0.zip)
+
+## Support
+
+For issues and feature requests, please use the [GitHub issue tracker](https://github.com/espressif/esp-webrtc-solution/issues).
+
+## Contributors
+We thank all contributors who helped improve this release.