Move section 7 files to directory man7

- Amends #262

Signed-off-by: Thomas Lauf <thomas.lauf@tngtech.com>

doc/man7/timew-ranges.7.in

@@ -0,0 +1,30 @@
+.TH timew-ranges 7 "${PACKAGE_DATE}" "${PACKAGE_STRING}" "User Manuals"
+.
+.SH NAME
+timew-ranges \- date and time ranges supported by Timewarrior
+.
+.SH SYNOPSIS
+.
+.SH DESCRIPTION
+An interval defines a block of time that is tracked.
+The syntax for specifying an interval is flexible, and may be one of:
+.
+  [from] <date>
+  [from] <date> to/- <date>
+  [from] <date> for <duration>
+  <duration> before/after <date>
+  <duration> ago
+  [for] <duration>
+.br
+Examples are:
+.
+  from 9:00
+  from 9am - 11am
+  from 9:00:00 to 11:00
+  from 9:00 for 2h
+  2h after 9am
+  2h before 11:00
+  2h ago
+  for 2h
+.br
+An interval is said to be 'closed' if there is both a start and end, and 'open' if there is no end date.