centralized performance resources

perf-cpp/scripts/io/chapter-1.in

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+1
+2

perf-cpp/scripts/io/chapter-1.out

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+Enter a number: 
+Enter another number: 
+Diff: -1; Sum: 3
+
+[code]: 0
+[time]: 2.52771 ms
+[debug]: false

perf-cpp/scripts/io/file.out

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+file.cc: In function ‘int main()’:
+file.cc:66:23: error: narrowing conversion of ‘3.0e+0’ from ‘double’ to ‘int’ [-Wnarrowing]
+   66 |   vector<int> a= { 3.0};
+      |                       ^
+file.cc: At global scope:
+file.cc:39:13: warning: ‘void YES()’ defined but not used [-Wunused-function]
+   39 | static void YES() {
+      |             ^~~
+file.cc:35:13: warning: ‘void NO()’ defined but not used [-Wunused-function]
+   35 | static void NO() {
+      |             ^~
+cc1plus: note: unrecognized command-line option ‘-Wno-sign-promotion’ may have been intended to silence earlier diagnostics
+
+[code]: 1