Benchmarks

[asinghvi17]

We were discussing the possibility of benchmarks in #7, and I came across these web pages that might be useful:

• https://www.crunchydata.com/blog/the-many-spatial-indexes-of-postgis
• https://gist.github.com/kadyb/420d42417287e839b990651189eff335
• https://github.com/anandaroop/spatial-benchmarks
• https://github.com/mloskot/spatial_index_benchmark/tree/master
• https://github.com/tzaeschke/TinSpin