Create README.md

Author: dim-s

bench/README.md

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+# JPHP Benchmark
+
+A set of synthetic performance tests of various parts of the PHP language.
+
+JPHP (1.2.8) Bench Results:
+
+```
+ -> fibonacci: 27.0 ms
+ -> loop: 187.0 ms
+ -> condition: 27.0 ms
+ -> math: 122.0 ms
+ -> fetch constants: 164.0 ms
+ -> constant call: 164.0 ms
+ -> simple func call: 1182.0 ms
+ -> simple method call: 958.0 ms
+ -> type hinting: 130.0 ms
+ -> new object: 340.0 ms
+ -> object property: 609.0 ms
+ -> array: 525.0 ms
+ -> string: 268.0 ms
+ -> closure: 143.0 ms
+ -> undefined: 19.0 ms
+ -> singleton pattern: 82.0 ms
+ -> array access object: 156.0 ms
+ -> getter + setter: 308.0 ms
+ -> iterator: 353.0 ms
+ -> service container: 137.0 ms
+ -> n-body: 367.0 ms
+
+-------- total: 6.27 s.
+```
+
+PHP 7.4.3
+
+```
+ -> fibonacci: 14 ms
+ -> loop: 933 ms
+ -> condition: 88 ms
+ -> math: 300 ms
+ -> fetch constants: 122 ms
+ -> constant call: 158 ms
+ -> simple func call: 514 ms
+ -> simple method call: 420 ms
+ -> type hinting: 118 ms
+ -> new object: 289 ms
+ -> object property: 213 ms
+ -> array: 578 ms
+ -> string: 405 ms
+ -> closure: 198 ms
+ -> undefined: 121 ms
+ -> singleton pattern: 64 ms
+ -> array access object: 146 ms
+ -> getter + setter: 214 ms
+ -> iterator: 126 ms
+ -> service container: 224 ms
+ -> n-body: 248 ms
+
+-------- total: 5.49 s.
+```