Documentation for foreach.h, test.h, timer.h and other changes

Change in timer.h. Now cmc_timer_stop will calculate the result so goodbye cmc_timer_calc

documentation/utl/timer.h/index.md

@@ -1,3 +1,63 @@
 # timer.h
 
-Simple code execution utility.
+A very simple library that encapsulates `clock()` from `<time.h>`, making life easier.
+
+## cmc_timer
+
+```c
+struct cmc_timer
+{
+    clock_t start;
+    clock_t stop;
+    double result;
+};
+```
+
+* `clock_t start` - Start of timing
+* `clock_t stop` - End of timing
+* `double result` - Result in milliseconds
+
+## cmc_timer_start
+
+Starts the timer by setting `start` with `clock()`.
+
+```c
+#define cmc_timer_start(timer)
+```
+
+* `timer` - A `struct cmc_timer` variable
+
+## cmc_timer_stop
+
+Sets the `stop` variable with `clock()` and calculates the `result` in milliseconds.
+
+```c
+#define cmc_timer_start(timer)
+```
+
+* `timer` - A `struct cmc_timer` variable
+
+## Example
+
+```c
+#include <stdio.h>
+
+#include "utl/timer.h"
+
+int main(void)
+{
+    struct cmc_timer t;
+
+    cmc_timer_start(t);
+
+    size_t total = 0;
+
+    for (size_t i = 0; i < 1000000000; i++)
+        total += i;
+
+    cmc_timer_stop(t);
+
+    printf("Sum took %.0lf milliseconds to calculate\n", t.result);
+}
+```
+