Add README.md

README.md

@@ -0,0 +1,18 @@
+feature | weaselab | fdb |
+|-|-|-|
+|based on|node-copying treap|node-copying treap|
+|bytes per node (worst-case)|64 + kv len + 1\*|96 + kv len|
+|cheaper iteration*|❌|✅|
+|efficient bulk queries|✅|❌|
+|entries per set (worst-case)|1|3|
+|node gc|mark-and-sweep|reference-counting|
+|pointer-size|32-bit|64-bit|
+|purge strategy|scan|search|
+|read from foreign thread|✅ |❌ |
+|recursion-free|✅ |❌|
+|returns node memory to OS|✅ |❌|
+|searches per point clear|1|5|
+|searches per range clear|2|5|
+|searches per set (worst-case)|1|4|
+
+\* Part of a set of tradeoffs that enable 1 entry per set worst-case