Add `naaative` theme

Naaative is based on `steeef` with a few minor changes:
* Adapted to look best with the 'Oceanic Next Dark' theme, but will look nice with almost any theme
* Use the Terminal theme colors instead of absolute (256) colors
* Displays the same Git indicators as a lot of custom prompts do (! for untracked changes, + for uncommitted changes, ? for untracked files)
* Adds a stash indicator ($)

Cheers :)

modules/prompt/functions/prompt_naaative_setup

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+/Users/jvisser/projects/zim/modules/prompt/themes/naaative.zsh-theme

modules/prompt/themes/naaative.zsh-theme

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+# Prompt style and colors based on the `steeef` default theme:
+# https://github.com/Eriner/zim/blob/master/modules/prompt/themes/steeef.zsh-theme
+# Adapted to `Oceanic Next Dark` colors
+# Requires the `git-info` zmodule to be included in the .zimrc file.
+
+prompt_naaative_git() {
+  [[ -n ${git_info} ]] && print -n " ${(e)git_info[prompt]}"
+}
+
+prompt_naaative_virtualenv() {
+  [[ -n ${VIRTUAL_ENV} ]] && print -n " (%F{blue}${VIRTUAL_ENV:t}%f)"
+}
+
+prompt_naaative_precmd() {
+  (( ${+functions[git-info]} )) && git-info
+}
+
+prompt_naaative_setup() {
+  [[ -n ${VIRTUAL_ENV} ]] && export VIRTUAL_ENV_DISABLE_PROMPT=1
+
+  local naaativepink
+  local naaativeorange
+  local naaativegreen
+  local naaativeaqua
+  local naaativered
+  local naaativeyellow
+
+  naaativepink='%F{magenta}'
+  naaativeorange='%F{yellow}'
+  naaativegreen='%F{green}'
+  naaativeaqua='%F{cyan}'
+  naaativered='%F{red}'
+
+  autoload -Uz add-zsh-hook
+  autoload -Uz colors && colors
+
+  prompt_opts=(cr percent subst)
+
+  add-zsh-hook precmd prompt_naaative_precmd
+
+  zstyle ':zim:git-info' verbose 'yes'
+  zstyle ':zim:git-info:branch' format '%b'
+  zstyle ':zim:git-info:commit' format '%c'
+  zstyle ':zim:git-info:action' format "(${naaativegreen}%s%f)"
+  zstyle ':zim:git-info:unindexed' format "${naaativepink}!"
+  zstyle ':zim:git-info:indexed' format "${naaativegreen}+"
+  zstyle ':zim:git-info:untracked' format "${naaativered}?"
+  zstyle ':zim:git-info:stashed' format "${naaativeorange}$"
+  zstyle ':zim:git-info:keys' format \
+    'prompt' "(${naaativeaqua}%b%c%I%i%u%S%f)%s"
+
+  PROMPT="
+${naaativepink}%n%f at ${naaativeorange}%m%f in ${naaativegreen}%~%f\$(prompt_naaative_git)\$(prompt_naaative_virtualenv)
+%(!.#.$) "
+  RPROMPT=''
+}
+
+prompt_naaative_setup "${@}"