Add how to compile pika

Author: hit12369

README.md

@@ -1,2 +1,17 @@
 # compiled-files
 Pre compiled files for various programs
+
+## How to compile pika
+```sh
+sudo apt install -y liblz4-1 liblz4-dev libzstd1 libzstd-dev libsnappy1v5 libsnappy-dev zlib1g zlib1g-dev libprotobuf23 libprotobuf-dev protobuf-compiler libgoogle-glog0v5 libgoogle-glog-dev libgflags2.2 libgflags-dev
+sudo apt install -y gcc-9 g++-9
+cd /tmp
+git clone https://github.com/OpenAtomFoundation/pika.git --depth 1
+cd pika
+git submodule update --init
+sed -i 's#^CXX=.*#CXX=g++-9#' Makefile
+sed -i '1s/^/DISABLE_WARNING_AS_ERROR=1\n/' third/rocksdb/Makefile
+make
+cd output
+tar -czvf pika-3.4.1.tar.gz *
+```