Benchmark results (#643)

* add results.md

* fix line-break

* fix typos

* fix column

Author: jam-lock

benchmarks/results.md

@@ -0,0 +1,52 @@
+Benchmarking Results
+============
+
+Windows 10
+--------------
+CPU: AMD Ryzen 5 1600
+
+Cores: 12
+
+GPU: GeForce RTX 3060
+
+RAM: 32GB
+
+```
+ hillshade.Hillshade.time_hillshade
+```
+nx | numpy | cupy | rtxpy 
+--- | --- | --- | --- 
+100 | 564±9μs | 1.33±0.07ms | 6.76±0.2ms 
+300 | 2.70±0.1ms | 1.30±0.04ms | 9.36±0.8ms 
+1000 | 38.0±2ms | 1.56±0.06ms | 26.6±2ms
+3000 | 352±30ms | 2.13±1ms | 172±1ms
+
+```
+polygonize.Polygonize.time_polygonize
+```
+nx | numpy | geopandas | spatialpandas | rasterio-geopandas
+--- | --- | --- | --- | ---
+100 | 3.74±0.8ms | failed | failed  | failed
+300 | 42.7±0.4ms | failed | failed  | failed
+1000 | 492±4ms | failed | failed | failed
+
+```
+slope.Slope.time_slope
+```
+nx | numpy | cupy 
+--- | --- | --- 
+100 | 784±50μs | 2.70±0.06ms
+300 | 1.83±0.1ms | 2.61±0.1ms
+1000 | 17.9±0.2ms | 2.70±0.08ms
+3000 | 171±1ms | 4.61±1ms
+10000 | 1.62±0.02s | 105±100ms
+
+```
+viewshed.Viewshed.time_viewshed
+```
+nx | numpy | rtxpy 
+--- | --- | --- 
+100 | 7.24±0.01ms | 8.18±0.2ms
+300 | 53.1±0.3ms | 10.4±0.2ms
+1000 | 657±0.07ms | 27.1±0.3ms
+3000 | 7.24±0.04s | 170±1ms