outline of summarize-neo4j
add intro
Merge branch 'summarize-neo4j' into summarize-neo4j-base
merge intro from summarize-neo4j
fill the introduction
add frst paragraph for why Neo4j runs fast
add a graph representing for name card exchange
write why neo4j is fast
write before the description of Neo4j's physical structure
add new chapter about licence
add about index-free adjacency
enhance some expression

less ちょうど
more explicit "just seek"
write till graph's graph
add neo4j-graph-graph representing physical structure of Neo4j's datastore
describe graph-graph
the bottom line of why-neo4j-is-fast
modify some expression and fix a mistake
add the case of Ameba
add a todo
the bottom line of why-neo4j-is-slow