diff-so-fancy submodule, symlink in bin/, README.md

Author: psprint

.gitmodules

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+[submodule "diff-so-fancy"]
+	path = diff-so-fancy
+	url = https://github.com/so-fancy/diff-so-fancy

README.md

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+# Zsh-Diff-So-Fancy
+
+The project [so-fancy/diff-so-fancy](https://github.com/so-fancy/diff-so-fancy) is very
+interesting, however I find it difficult to a) install it, b) hook it up to git.
+
+For the a), I just like to install things as user, in home directory, not system-wide via
+package manager. So even if the package exists (like it is in e.g. Homebrew for OS X, it
+has `diff-so-fancy`), I try to not use it. Think about remote shell accounts, is it good
+to ask every system administrator to install your favorite packages?
+
+With this Zsh plugin, you simply add two lines to `.zshrc`:
+
+```zsh
+zplugin ice as"program" pick"bin/git-dsf"
+zplugin light zdharma/zsh-diff-so-fancy
+```
+
+This will install `diff-so-fancy` on every account where you use Zshell, and automatically
+equip `git` with subcommand `dsf`. No need to use system package manager and to configure
+`git`. Of course, if you have the following standard line in your `.gitconfig`, it will
+still work normally:
+
+```
+[core]
+        pager = diff-so-fancy | less -FXRi
+```
+
+(because this plugin adds `diff-so-fancy` to `$PATH`).
+
+# A Few Details
+
+[so-fancy/diff-so-fancy](https://github.com/so-fancy/diff-so-fancy) is cloned from
+Github as submodule. The plugin has `bin/git-dsf` script which adds subcommand `dsf`
+to git. That's basically everything needed: convenient way of installing (single Zsh
+plugin manager invocation), updating (Zsh plugin managers can easily update) and
+integrating with `git`.

bin/diff-so-fancy

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+../diff-so-fancy/diff-so-fancy