Added README

.gitignore

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+# Large database files
+graph7.db
+graph8.db
+graph9.db
+graph10.db
+
+special/graph7_special.db
+special/graph8_special.db
+special/graph9_special.db
+special/graph10_special.db
+
+# Temp files
+*~
+\#*
+.\#*
+*.bak

README.md

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+## Encyclopedia of Finite Graphs
+### database for simple connected graphs
+
+This is the database file for [Encyclopedia of Finite Graphs](https://github.com/thoppe/Encyclopedia-of-Finite-Graphs) project.
+This contains all of the simple connected graphs up to order 10 and a large collection of their invariants stored as an integer table.
+Up to order 6, there is a collection of "special" invariants there are stored in a custom table (see main project for details).
+
+To extract the database, run (requires `pbzip2` and `split`)
+
+    make extract
+
+To compress the database again, run
+
+    make compress
+
+If you've cloned the Encyclopedia project, you can automatically download the database by running:
+
+    git submodule add https://github.com/thoppe/Simple-connected-graph-invariant-database.git database
+
+Note we are unable to store the special invariants for larger graphs due to size constraints. 
+They will have to be recomputed for `n>6`.