Add completion plugin for IPFS (InterPlanetary File System) (#4737)

plugins/ipfs/LICENSE

+The MIT License (MIT)
+
+Copyright (c) 2015 Angel Ramboi
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

plugins/ipfs/README.md

+# zsh-ipfs
+
+zsh completion plugin for [The InterPlanetary File System (IPFS)][1]
+
+Please submit issues and pull requests to the [main zsh-ipfs repo][2].
+
+### About
+
+[IPFS (InterPlanetary File System)][1] is a peer-to-peer hypermedia protocol
+designed to make the web faster, safer, and more open.
+
+### License
+
+See: https://github.com/hellounicorn/zsh-ipfs/blob/master/LICENSE
+
+[1]: http://ipfs.io/
+[2]: https://github.com/hellounicorn/zsh-ipfs