document benchmarks

Author: StarpTech

benchmarks/README.md

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+# Benchmark
+
+Compare `apollo-datasource-http` with apollo's `apollo-datasource-rest`
+
+```
+{
+  'apollo-datasource-rest': { startTime: 86302094103500n, endTime: 86302716018200n },
+  'apollo-datasource-http': { startTime: 86302111594200n, endTime: 86302736876100n }
+}
+Results for 1000 subsequent requests: 
+apollo-datasource-rest    | total time: 621914700ns (621.915ms)
+apollo-datasource-http    | total time: 625281900ns (625.282ms)
+---
+apollo-datasource-http <> apollo-datasource-rest percent change: 0.541%
+```
+
+**Result:** Difference of +-0.5%. You can use `apollo-datasource-http` without negative performance cost.