Add .gitignore, CMakeLists.txt, ConflictSet.cpp

.gitignore

@@ -0,0 +1,2 @@
+.cache
+build

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.18)
+project(
+  conflict-set
+  VERSION 0.0.1
+  DESCRIPTION "A data structure for detecting mvcc read-write conflicts in a keyspace of lexicographically-ordered byte sequences."
+  LANGUAGES CXX)
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+add_library(conflict_set ConflictSet.cpp ConflictSet.h)