initial submit for KVRocks

application/KVRocks/insdb/insdb/insdb-master/BUILD_PREPARE.md

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+InSDB build Prepare...
+
+#Dependency
+ -c++14
+ -folly facebook libary (also need googletest library for test).
+ -gcc 4.9+ and boost library compiled with c++14 support
+ -libdouble-conversion-dev
+ -libgoogle-glog-dev
+ -libdl
+
+##googletest library install
+googletest is required to build and run folly's test code.  You can download
+it from https://github.com/google/googletest/archive/release-1.8.0.tar.gz
+The following commands can be used to download and install it:
+
+```
+wget https://github.com/google/googletest/archive/release-1.8.0.tar.gz && \
+tar zxf release-1.8.0.tar.gz && \
+rm -f release-1.8.0.tar.gz && \
+cd googletest-release-1.8.0 && \
+cmake configure . && \
+make && \
+make install
+```
+
+
+## Install required library
+
+The following packages are required (feel free to cut and paste the apt-get
+command below):
+
+```
+sudo apt-get install \
+    g++ \
+    cmake \
+    libboost-all-dev \
+    libevent-dev \
+    libdouble-conversion-dev \
+    libgoogle-glog-dev \
+    libgflags-dev \
+    libiberty-dev \
+    liblz4-dev \
+    liblzma-dev \
+    libsnappy-dev \
+    make \
+    zlib1g-dev \
+    binutils-dev \
+    libjemalloc-dev \
+    libssl-dev \
+    libc6-dev \
+    pkg-config
+```
+
+If advanced debugging functionality is required, use:
+
+```
+sudo apt-get install \
+    libunwind8-dev \
+    libelf-dev \
+    libdwarf-dev
+```
+
+Install folly, folly need to be compiled with -fPIC, so after download you need to chagne Cmake files.
+
+Download
+
+```
+  git clone https://github.com/facebook/folly.git
+```
+Update Cmake file
+```
+  vim folly/CMake/FollyCompilerUnix.cmake
+  (add line -fPIC in target_compile_options)
+```
+Build
+```
+  cd folly
+  mkdir _build && cd _build
+  cmake configure ..
+  make -j $(nproc)
+  make install
+