wd.plugin: Added checks, readme and completion

plugins/wd/README.md

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+## wd
+
+**Maintainer:** [mfaerevaag](https://github.com/mfaerevaag)
+
+`wd` (warp directory) lets you jump to custom directories in zsh, without using cd. Why? Because cd seems ineffecient when the folder is frequently visited or has a long path. [Source](https://github.com/mfaerevaag/wd)
+
+### Usage
+
+ * Add warp point to current working directory:
+
+        wd add test
+
+    If a warp point with the same name exists, use `add!` to overwrite it.
+
+ * From an other directory, warp to test with:
+
+        wd test
+
+ * You can warp back to previous directory, and so on, with the puncticulation syntax:
+
+        wd ..
+        wd ...
+
+    This is a wrapper for the zsh `dirs` function.
+
+ * Remove warp point test point:
+
+        wd rm test
+
+ * List warp points to current directory (stored in `~/.warprc`):
+
+        wd show
+
+ * List all warp points (stored in `~/.warprc`):
+
+        wd ls
+
+ * Print usage with no opts or the `help` argument.