add plugin for conda

plugins/conda/README.md

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+# conda
+
+The plugin displays information of the created virtual container of conda and allows background theming.
+
+To use it, add `conda` to the plugins array of your zshrc file:
+```
+plugins=(... conda)
+```
+
+The plugin creates a `conda_prompt_info` function that you can use in your
+theme, which displays the basename of the current `$CONDA_DEFAULT_ENV`. It uses
+two variables to control how that is shown:
+
+- `ZSH_THEME_CONDA_PREFIX`: sets the prefix of the CONDA_DEFAULT_ENV.
+Defaults to `[`.
+
+- `ZSH_THEME_CONDA_SUFFIX`: sets the suffix of the CONDA_DEFAULT_ENV.
+Defaults to `]`.

plugins/conda/conda.plugin.zsh

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+function conda_prompt_info(){
+  [[ -n ${CONDA_DEFAULT_ENV} ]] || return
+  echo "${ZSH_THEME_CONDA_PREFIX=[}${CONDA_DEFAULT_ENV:t:gs/%/%%}${ZSH_THEME_CONDA_SUFFIX=]}"
+}
+
+# disables display (${CONDA_DEFAULT_ENV})
+export CONDA_CHANGEPS1=false