whenxuan: create the notebook for vtfmtd

Author: wwhenxuan

README.md

@@ -147,6 +147,7 @@ plot_IMFs(signal, IMFs)             # per-channel panels
 | [`SJMD`](https://github.com/wwhenxuan/PySDKit/blob/main/pysdkit/_jmd/sjmd.py) / `SMJMD` (Successive Jump and Mode Decomposition) |         [[paper]](https://arxiv.org/abs/2504.08453)          |                          [[code]]()                          |   ✔️   |
 | [`ESMD`](https://github.com/wwhenxuan/PySDKit/blob/main/pysdkit/_emd/esmd.py) (Extreme-Point Symmetric Mode Decomposition) |          [[paper]](https://arxiv.org/abs/1303.6540)          |         [[code]](https://github.com/WuShichao/esmd)          |   ✔️   |
 |   [`STNBMD`]() (Short-Time Narrow-Band Mode Decomposition)   | [[paper]](https://www.sciencedirect.com/science/article/pii/S0022460X16002443?via%3Dihub) | [[code]](https://ww2.mathworks.cn/matlabcentral/fileexchange/56226-short-time-narrow-band-mode-decomposition-stnbmd-toolbox) |   ✖️   |
+| [`VTFMTD`](https://github.com/wwhenxuan/PySDKit/blob/main/pysdkit/_tfa/vftmtd.py) (Variational TF Mode Tracking Decomposition) | [[paper]](https://www.sciencedirect.com/science/article/pii/S0165168426001179) | [[code]](https://www.mathworks.com/matlabcentral/fileexchange/183389-variational-time-frequency-mode-tracking-decomposition) |   ✔️   |
 | [`SWD`](https://github.com/wwhenxuan/PySDKit/blob/main/pysdkit/_osd/swd.py) (Swarm Decomposition) |   [[paper]](https://doi.org/10.1016/j.sigpro.2016.09.004)    |  [[code]](https://github.com/gkaposto/Swarm-Decomposition)   |   ✔️   |
 | [`OSD`](https://github.com/wwhenxuan/PySDKit/blob/main/pysdkit/_osd/osd.py) (Optimization-based Signal Decomposition) | [[paper]](https://web.stanford.edu/~boyd/papers/sig_decomp_mprox.html) |   [[code]](https://github.com/cvxgrp/signal-decomposition)   |   ✔️   |
 | [`STL`](https://github.com/wwhenxuan/PySDKit/blob/main/pysdkit/tsa/_stl.py) (Seasonal-Trend decomposition using LOESS) | [[paper]](https://www.nniiem.ru/file/news/2016/stl-statistical-model.pdf) | [[code]](https://www.statsmodels.org/stable/examples/notebooks/generated/stl_decomposition.html) |   ✔️   |

examples/tfa/vtfmtd.ipynb

@@ -73,3 +73,5 @@ include = ["pysdkit*"]
 "pysdkit._tid.data" = ["*.npy"]
 "pysdkit._imd" = ["data/*.npy"]
 "pysdkit._imd.data" = ["*.npy"]
+"pysdkit._tfa" = ["data/*.npy"]
+"pysdkit._tfa.data" = ["*.npy"]