Add deprecation disclaimer to OpenSfM README

Summary: Added a disclaimer notice to the OpenSfM README.md indicating that the repository is no longer under active development.

Differential Revision: D99837454

fbshipit-source-id: 4f256b95eb434df01486847dfcf2ad9d40d1bd4e

Author: Fabian Schenk

README.md

@@ -1,8 +1,12 @@
+# NOTE: This repository is no longer under active development
+
 OpenSfM
 =======
+
 [![Conda](https://github.com/mapillary/OpenSfM/actions/workflows/conda.yml/badge.svg)](https://github.com/mapillary/OpenSfM/actions/workflows/conda.yml) [![Docker Ubuntu 20.04](https://github.com/mapillary/OpenSfM/actions/workflows/docker_ubuntu20.yml/badge.svg)](https://github.com/mapillary/OpenSfM/actions/workflows/docker_ubuntu20.yml) [![Docker Ubuntu 24.04](https://github.com/mapillary/OpenSfM/actions/workflows/docker_ubuntu24.yml/badge.svg)](https://github.com/mapillary/OpenSfM/actions/workflows/docker_ubuntu24.yml)
 
 ## Overview
+
 OpenSfM is a Structure from Motion library written in Python. The library serves as a processing pipeline for reconstructing camera poses and 3D scenes from multiple images. It consists of basic modules for Structure from Motion (feature detection/matching, minimal solvers) with a focus on building a robust and scalable reconstruction pipeline. It also integrates external sensor (e.g. GPS, accelerometer) measurements for geographical alignment and robustness. A JavaScript viewer is provided to preview the models and debug the pipeline.
 
 <p align="center">
@@ -11,19 +15,18 @@ OpenSfM is a Structure from Motion library written in Python. The library serves
 
 Checkout this [blog post with more demos](http://blog.mapillary.com/update/2014/12/15/sfm-preview.html)
 
-
 ## Getting Started
 
 * [Building the library][]
 * [Running a reconstruction][]
 * [Documentation][]
 
-
 [Building the library]: https://opensfm.org/docs/building.html (OpenSfM building instructions)
 [Running a reconstruction]: https://opensfm.org/docs/using.html (OpenSfM usage)
 [Documentation]: https://opensfm.org/docs/ (OpenSfM documentation)
 
 ## License
+
 OpenSfM is BSD-style licensed, as found in the LICENSE file.  See also the Facebook Open Source [Terms of Use][] and [Privacy Policy][]
 
 [Terms of Use]: https://opensource.facebook.com/legal/terms (Facebook Open Source - Terms of Use)