1. organize project folder structure 2. add faiss_wrapper interface

pyengine/engine/faiss_wrapper/faiss_wrapper.py

+import faiss
+import numpy as np
+
+class FaissSearch():
+    def __init__(self, index, id_to_vector_map):
+        pass
+
+    # def search_by_ids(self, id_list, k):
+    #     pass
+
+    def search_by_vectors(self, vector_list, k):
+        # return both id and vector
+        pass
+
+    def __search__(self, id_list, vector_list, k):
+        pass
+
+
+class FaissIndex():
+    def build_index(self, vector_list, dimension):
+        # return index
+        pass
+
+    # def build_index_cpu(self):
+    #     pass
+
+    # def build_index_gpu(self):
+    #     pass
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