add jni and docker files

Dockerfile

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+FROM centos:7
+
+RUN yum install -y lapack lapack-devel
+
+# Install necessary build tools
+RUN yum install -y gcc-c++ make swig3
+RUN yum install -y java-1.8.0-openjdk java-1.8.0-openjdk-devel maven
+
+COPY . /opt/JFaiss
+WORKDIR /opt/JFaiss/faiss
+
+# Install faiss
+RUN ./configure --prefix=/usr --libdir=/usr/lib64 --without-cuda
+RUN make -j $(nproc)
+RUN make install
+
+# Create source files
+WORKDIR /opt/JFaiss/jni
+RUN make

jni/Makefile

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+# Copyright (c) Facebook, Inc. and its affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+-include ../faiss/makefile.inc
+
+ifneq ($(strip $(NVCC)),)
+	SWIGFLAGS += -DGPU_WRAPPER
+endif
+
+JAVACFLAGS = -I /usr/lib/jvm/java/include/ -I /usr/lib/jvm/java/include/linux/
+SWIGJAVASRC = ../cpu/src/main/java/com/vectorsearch/faiss/swig
+
+all: build
+
+# Also silently generates swigfaiss.py.
+swigfaiss.cpp: swigfaiss.swig ../faiss/libfaiss.a
+	mkdir -p $(SWIGJAVASRC)
+	$(SWIG) -java -c++ -Doverride= -I../ $(SWIGFLAGS) -package com.vectorsearch.faiss.swig -outdir $(SWIGJAVASRC) -o $@ $<
+
+swigfaiss_avx2.cpp: swigfaiss.swig ../faiss/libfaiss.a
+	mkdir -p $(SWIGJAVASRC)
+	$(SWIG) -java -c++ -Doverride= -module swigfaiss_avx2 -I../ $(SWIGFLAGS) -package com.vectorsearch.faiss.swig -outdir $(SWIGJAVASRC) -o $@ $<
+
+%.o: %.cpp
+	$(CXX) $(CPPFLAGS) $(CXXFLAGS) $(CPUFLAGS) $(JAVACFLAGS) \
+               -I../ -c $< -o $@
+
+# Extension is .so even on OSX.
+_%.so: %.o ../faiss/libfaiss.a
+	$(CXX) $(SHAREDFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
+
+build: _swigfaiss.so
+	mkdir -p ../cpu/src/main/resources
+	cp _swigfaiss.so ../cpu/src/main/resources/
+
+# install: build
+# 	$(PYTHON) setup.py install
+#
+
+clean:
+	rm -f swigfaiss*.cpp swigfaiss*.o  _swigfaiss*.so
+	rm -rf $(SWIGJAVASRC)
+
+
+.PHONY: all build install #clean install