Create README.md

add EfficientTDNN description.

README.md

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+# EfficientTDNN
+
+Model Version
+- Maximum Size: One single model with the maximum size.
+- Dynamic Kernel: The model enables various kernel sizes in $\{1,3,5\}$.
+- Dynamic Depth: The model enables additional various depth in $\{2,3,4\}$ based on \textbf{Dynamic Kernel} version.
+- Dynamic Width 1: The model enable additional various width in $[0.5, 1.0]$ based on \textbf{Dynamic Depth} version.
+- Dynamic Width 2: The model enable additional various width in $[0.25, 0.5]$ based on \textbf{Dynamic Width 1} version.
+
+It was introduced by [EfficientTDNN](https://arxiv.org/abs/2103.13581).
+
+TODO upload weights.