Create README.md for semantic_seg

sem_seg/README.md

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+## Semantic segmentation of indoor scenes
+
+### Dataset
+
+Donwload prepared HDF5 data for training:
+```
+sh +x download_data.sh
+```
+Download 3D indoor parsing dataset (<a href="http://buildingparser.stanford.edu/dataset.html">S3DIS Dataset</a>) for testing and visualization. "Stanford3dDataset_v1.2_Aligned_Version.zip" of the dataset is used. Unzip the downloaded file into "dgcnn/data/", and then run
+```
+python collect_indoor3d_data.py
+```
+to generate "dgcnn/data/stanford_indoor3d"