Added atom plugin for cygwin

plugins/atom-cygwin/README.md

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+## atom-cygwin
+
+This plugin allows invoking the Atom Editor from Cygwin using the `atom` command.
+For this purpose, it uses `cygpath` to convert between Unix and Windows paths.
+
+### Requirements
+
+ * [Atom](https://atom.io/)
+ * [Cygwin](https://www.cygwin.com/)
+
+### Usage
+
+Same as the original CLI script (pointed by `${LOCALAPPDATA}/atom/bin/atom`).
+
+ * If `atom` command is called without an argument, launch Atom
+ * If `atom` is passed a directory, open it in Atom
+ * If `atom` is passed a file, open it in Atom

plugins/atom-cygwin/atom-cygwin.plugin.zsh

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+if [[ "$OSTYPE" == "cygwin" ]]; then
+    local _atom_path > /dev/null 2>&1
+
+    _atom_path=${LOCALAPPDATA}/atom/bin/atom
+
+    if [[ -a $_atom_path ]]; then
+        cyg_open_atom()
+        {
+            if [[ -n $1 ]]; then
+                ${_atom_path} `cygpath -w -a $1`
+            else
+                ${_atom_path}
+            fi
+        }
+
+        alias atom=cyg_open_atom
+    fi
+fi