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M README.md

@@ 2,3 2,66 @@
 
 [![License:Artistic](https://img.shields.io/badge/License-Artistic-yellow.svg)](https://opensource.org/licenses/artistic-license-2.0)
 ![ci](https://github.com/bradclawsie/Lang-Go-Mod/workflows/ci/badge.svg)
+
+```
+NAME
+
+Lang::Go::Mod - parse and model go.mod files
+
+SYNOPSIS
+
+   # $ cat go.mod
+   # module github.com/example/my-project
+   # go 1.16
+   # exclude (
+   #    example.com/whatmodule v1.4.0
+   # )
+   # replace (
+   #    github.com/example/my-project/pkg/app = ./pkg/app
+   # )
+   # require (
+   #    golang.org/x/sys v0.0.0-20210510120138-977fb7262007 // indirect
+   # )
+
+   use Lang::Go::Mod qw(read_go_mod parse_go_mod);
+
+   my $go_mod_path = '/path/to/go.mod';
+
+   # read and parse the go.mod file
+   # all errors croak, so wrap this in your favorite variant of try/catch
+   # to gracefully manage errors
+   my $m = read_go_mod($go_mod_path);
+   # use parse_go_mod to parse the go.mod content if it is already in a scalar
+
+   print $m-{module}; # github.com/example/my-project
+   print $m-{go}; # 1.16
+   print $m-{exclude}-{'example.com/whatmodule'}; # [v1.4.0]
+   print $m-{replace}-{'github.com/example/my-project/pkg/app'}; # ./pkg/app
+   print $m-{'require'}-{'golang.org/x/sys'}; # v0.0.0-20210510120138-977fb7262007
+
+DESCRIPTION
+
+This module creates a hash representation of a go.mod file.
+Both single line and multiline exclude, replace, and require
+sections are supported. For a full reference of the go.mod format, see 
+
+https://golang.org/doc/modules/gomod-ref
+
+EXPORTED METHODS
+
+read_go_mod
+
+Given a full filepath for a go.mod file, read it, parse it and
+return the hash representation of the contents. All errors croak.
+
+parse_go_mod
+
+Given a scalar of the contents of a go.mod file, parse it and 
+return the hash representation of the contents. All errors croak.
+
+LICENSE 
+
+Lang::Go::Mod is licensed under the same terms as Perl itself.
+
+https://opensource.org/licenses/artistic-license-2.0
+```