all: add configuration for setting default copyright year

The `copyright_year` set the default year to be used in
`SPDX-FileCopyrightText`.
The year can be a single year (for example "2026"), range of year (for
example, "2000-2026"), or list of year with comma separated (for example,
"2000,2001,2026"); as long as there is no space in between.

1 files changed, 21 insertions, 5 deletions

diff --git a/README.md b/README.md
index 36a30fe..5327e7e 100644
--- a/README.md
+++ b/README.md
@@ -69,6 +69,7 @@ following content,
 
 [default]
 license_identifier =
+copyright_year =
 file_copyright_text =
 max_line_match = 10
 
@@ -134,11 +135,26 @@ affect the program during scan and apply.
 
 ### default section
 
-This section define the default license identifier and copyright text to be
-inserted into file if no `match-license` or `match-copyright` found in the
-file.
-You should fill the `license_identifier` and `file_copyright_text` before
-continue running the program.
+This section define the default license identifier, year, and copyright text
+to be inserted into file if no `match-license` or `match-copyright` found in
+the file.
+
+The `license_identifier` set the default license using one of SPDX license
+identifier from [https://spdx.org/licenses/]() .
+For example, `GPL-3.0-only` for GNU General Public License v3.0 only.
+
+The `copyright_year` set the default year to be used in
+`SPDX-FileCopyrightText`.
+The year can be a single year (for example "2026"), range of year (for
+example, "2000-2026"), or list of year with comma separated (for example,
+"2000,2001,2026"); as long as there is no space in between.
+
+The `file_copyright_text` set the default author and contact in
+`SPDX-FileCopyrightText`.
+For example, "John Doe <john.doe@example>".
+
+You should fill the `license_identifier`, `copyright_year`, and
+`file_copyright_text` before continue running the program.
 
 The `max_line_match` define the number of lines to be searched at the
 top and bottom of file for `SPDX-*` identifiers, `match-license`, and