Created Fuzzy completion (markdown)

Fuzzy-completion.md

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+## zsh
+
+### Dedicated completion key
+
+Instead of using `TAB` key with a trigger sequence, you can assign a dedicated key for fuzzy completion while retaining the default behavior of `TAB` key.
+
+Add the following lines *after* `source ~/.fzf.zsh`
+
+```sh
+export FZF_COMPLETION_TRIGGER=''
+bindkey '^T' fzf-completion
+bindkey '^I' $fzf_default_completion
+```
+
+Then `CTRL-T` will trigger context-aware fuzzy completion.
+
+### Caveats
+
+#### `setopt vi`
+
+`setopt vi` resets `TAB` key binding, so unless you've assigned a dedicated key, fuzzy completion will become unavailable.
+
+```sh
+> bindkey '^I'
+"^I" fzf-completion
+
+> setopt vi
+> bindkey '^I'
+"^I" expand-or-complete
+```
+
+So make sure that `.fzf.zsh` (or `completion.zsh`) is sourced after `setopt vi`.