Add MIT LICENSE and model card (RIFE v4.9, attribution to hzwer/Practical-RIFE)

LICENSE

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+MIT License
+
+Copyright (c) 2021 hzwer (RIFE / Practical-RIFE)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+---
+license: mit
+library_name: onnx
+pipeline_tag: video-to-video
+tags:
+  - rife
+  - frame-interpolation
+  - video
+  - onnx
+  - webgpu
+---
+
+# RIFE v4.9 (ONNX)
+
+`rife49.onnx` — an ONNX export of **RIFE v4.9** for video frame interpolation
+(synthesising the in-between frames when raising a video's frame rate). Runs
+client-side with onnxruntime-web on the WASM or WebGPU execution providers.
+
+## Inputs / outputs
+
+- **Inputs:** `img0` float32 `[1, 3, H, W]`, `img1` float32 `[1, 3, H, W]`,
+  `timestep` float32 `[1]`
+- **Output:** `output` float32 `[1, 3, H, W]` — the interpolated frame at
+  `timestep` (0..1) between `img0` and `img1`
+- Planar RGB (CHW), values in 0..1. `H` and `W` are padded to a multiple of 32
+  for reference quality.
+
+## Provenance & license
+
+- **Algorithm:** RIFE — *Real-Time Intermediate Flow Estimation for Video Frame
+  Interpolation* (Megvii, ECCV 2022), original code MIT
+  (`Copyright (c) Megvii Inc.`).
+- **Weights:** [hzwer/Practical-RIFE](https://github.com/hzwer/Practical-RIFE)
+  (v4.9). Practical-RIFE releases both its code **and its model weights** under
+  the **MIT license** — its README states the model links are "under the same
+  MIT license as this project."
+- **ONNX export:**
+  [yuvraj108c/rife-onnx](https://huggingface.co/yuvraj108c/rife-onnx)
+  (`rife49_ensemble_True_scale_1_sim.onnx`).
+
+**License: MIT.** See [`LICENSE`](./LICENSE) (`Copyright (c) 2021 hzwer`). This
+repository mirrors the model so it can be fetched at runtime by the Edge Tools
+app; a format conversion of MIT-licensed weights remains MIT.