[DATALAD] Added subdataset

.gitmodules

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+[submodule "speech-maturity-dataset"]
+	path = speech-maturity-dataset
+	url = git@gin.g-node.org:/LAAC-LSCP/speech-maturity-dataset.git
+	datalad-id = 2dfb2bc5-aaf7-40c1-84ad-1f52b29cf3ef
+	datalad-url = git@gin.g-node.org:/LAAC-LSCP/speech-maturity-dataset.git

speech-maturity-dataset

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+Subproject commit be749a8fd6de9cbe58f7e8751977676cf8d696f6