doc: Add more license details

Related to #137

LICENSE

@@ -1,3 +1,5 @@
+MIT License
+
 Copyright (c) 2021 Mattias Wadman
 colorjson fork and various code in gojqextra package Copyright (c) 2019-2021 itchyny
 

README.md

@@ -227,3 +227,18 @@ for inventing the [jq](https://github.com/stedolan/jq) language.
 - [GNU poke](https://www.jemarch.net/poke)
 - [ffmpeg/ffprobe](https://ffmpeg.org)
 - [hexdump](https://git.kernel.org/pub/scm/utils/util-linux/util-linux.git/tree/text-utils/hexdump.c)
+
+## License
+
+`fq` is distributed under the terms of the MIT License.
+
+See the [LICENSE](LICENSE) file for license details.
+
+Licenses of direct dependencies:
+
+- Forked version of gojq https://github.com/itchyny/gojq/blob/main/LICENSE (MIT)
+- Forked version of readline https://github.com/chzyer/readline/blob/master/LICENSE (MIT)
+- gopacket https://github.com/google/gopacket/blob/master/LICENSE (BSD)
+- mapstructure https://github.com/mitchellh/mapstructure/blob/master/LICENSE (MIT)
+- go-difflib https://github.com/pmezard/go-difflib/blob/master/LICENSE (BSD)
+- golang/x/text https://github.com/golang/text/blob/master/LICENSE (BSD)