New "cygwin" plugin

Cygwin-specific settings. For now, add some Windows paths to the
Cygwin/ZSH search $PATH.

diff --git a/plugins/cygwin/README.md b/plugins/cygwin/README.md
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+++ b/plugins/cygwin/README.md
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+## cygwin
+
+Setup *Cygwin* (https://cygwin.com/) specific configuration.
+
+### Environment
+
+- `$PATH`: Append standard directories of Windows to search path.

diff --git a/plugins/cygwin/cygwin.zprofile b/plugins/cygwin/cygwin.zprofile
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+++ b/plugins/cygwin/cygwin.zprofile
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+# AX-ZSH: Alex' Modular ZSH Configuration
+# cygwin.zprofile: Setup CCache environment
+
+[[ -d /cygdrive ]] || return
+
+# Search for directories and apprepend it to "PATH"
+for dir (
+       /cygdrive/c/Windows
+       /cygdrive/c/Windows/System32
+       /cygdrive/c/Windows/System32/WindowsPowerShell/v1.0
+); do
+       [[ -d "$dir" ]] && PATH="$PATH:$dir"
+done
+unset dir