feat: article on diff-highlight

knowledge base/diff-highlight.md

@@ -0,0 +1,52 @@
+# `diff-highlight`
+
+Pretty diff highlighter with emphasis on changed words.
+
+## Table of contents <!-- omit in toc -->
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+1. [Sources](#sources)
+
+## TL;DR
+
+```sh
+# Installation.
+pip install 'diff-highlight'
+```
+
+In `${HOME}/.gitconfig`:
+
+```ini
+# Set as default.
+[core]
+    pager = diff-highlight | less
+
+# Apply to individual commands.
+[pager]
+    log = diff-highlight | less
+    show = diff-highlight | less
+    diff = diff-highlight | less
+```
+
+## Further readings
+
+- [Github]
+- [PyPi] page
+- [Git]
+
+## Sources
+
+All the references in the [further readings] section, plus the following:
+
+<!-- project's references -->
+[github]: https://github.com/tk0miya/diff-highlight
+[pypi]: https://pypi.org/project/diff-highlight/
+
+<!-- in-article references -->
+[further readings]: #further-readings
+
+<!-- internal references -->
+[git]: git.md
+
+<!-- external references -->