doc: add more examples to vlib/time/README.md (#16362)

vlib/time/README.md

@@ -1,6 +1,6 @@
 ## Description:
 
-`time` provides utilities for working with time and dates:
+V's `time` module, provides utilities for working with time and dates:
 - parsing of time values expressed in one of the commonly used standard time/date formats
 - formatting of time values
 - arithmetic over times/durations
@@ -10,8 +10,68 @@
 
 ## Examples:
 
+You can see the current time. [See](https://play.vlang.io/?query=c121a6dda7):
 ```v
 import time
 
 println(time.now())
 ```
+
+`time.Time` values can be compared, [see](https://play.vlang.io/?query=133d1a0ce5):
+```v
+import time
+
+const time_to_test = time.Time{
+	year: 1980
+	month: 7
+	day: 11
+	hour: 21
+	minute: 23
+	second: 42
+	microsecond: 123456
+	unix: 332198622
+}
+
+println(time_to_test.format())
+
+assert '1980-07-11 21:23' == time_to_test.format()
+assert '1980-07-11 21:23:42' == time_to_test.format_ss()
+assert '1980-07-11 21:23:42.123' == time_to_test.format_ss_milli()
+assert '1980-07-11 21:23:42.123456' == time_to_test.format_ss_micro()
+```
+
+You can also parse strings to produce time.Time values,
+[see](https://play.vlang.io/p/b02ca6027f):
+```v
+import time
+
+s := '2018-01-27 12:48:34'
+t := time.parse(s) or { panic('failing format: $s | err: $err') }
+println(t)
+println(t.unix)
+```
+
+V's time module also has these parse methods:
+```v ignore
+fn parse(s string) !Time
+fn parse_iso8601(s string) !Time
+fn parse_rfc2822(s string) !Time
+fn parse_rfc3339(s string) !Time
+```
+
+Another very useful feature of the `time` module is the stop watch,
+for when you want to measure short time periods, elapsed while you
+executed other tasks. [See](https://play.vlang.io/?query=f6c008bc34):
+```v
+import time
+
+fn do_something() {
+	time.sleep(510 * time.millisecond)
+}
+
+fn main() {
+	sw := time.new_stopwatch()
+	do_something()
+	println('Note: do_something() took: $sw.elapsed().milliseconds() ms')
+}
+```