i figured out how to put a bunch of commits in one PR lol i'm good at this (#83)

* archival notice for vision doc

* contributors archival notice

* mission archival notice

* values archival notice

* Update README.md

2018-VISION.md

@@ -1,3 +1,7 @@
+## This document has been archived, and will no longer be maintained or updated. The current version can be found in the Zcash Foundation’s new canonical [GitHub repo](https://github.com/ZcashFoundation/zfnd/blob/master/about/2018-vision.md), which publishes directly to a corresponding section of our [website](https://www.zfnd.org/about/2018-vision/).
+
+## Archival date: 1/17/2019
+
 # Zcash Foundation Vision and Roadmap
 ## For 2018 and Beyond
 *by Josh Cincinnati, Executive Director of the Zcash Foundation*

CONTRIBUTORS.md

@@ -1,3 +1,7 @@
+## This document has been archived, and will no longer be maintained or updated.
+
+## Archival date: 1/17/2019
+
 The Zcash Foundation's initial documents (the mission statement, values statement, and initial announcement) were written with the input and contributions of many volunteers, as listed below. This file will be updated to reflect the contributions of additional volunteers as the Foundation evolves:
 - Andrew Miller
 - Eran Tromer
@@ -9,4 +13,4 @@ The Zcash Foundation's initial documents (the mission statement, values statemen
 - Peter Van Valkenburgh
 - Rainey Reitman
 - Naval Ravikant
-- Matthew Green
+- Matthew Green

MISSION.md

@@ -1,3 +1,7 @@
+## This document / folder has been archived, and will no longer be maintained or updated. The current version can be found in the Zcash Foundation’s new canonical [GitHub repo](https://github.com/ZcashFoundation/zfnd/blob/master/about/mission.md), which publishes directly to a corresponding section of our [website](https://www.zfnd.org/about/#mission).
+
+## Archival date: 1/17/2019
+
 Zcash Foundation Mission Statement
 ==================================
 Per our [501(c)3 application](IncorporationDocs/Zcash%20Foundation%201023.pdf), our mission is to be a public charity dedicated to building Internet payment and privacy infrastructure for the public good, primarily serving the users of the Zcash protocol and blockchain. Our activities span three main pillars:

README.md

@@ -1,3 +1,7 @@
+## This GitHub repo has been archived, and will no longer be maintained or updated. The current version can be found in the Zcash Foundation’s new consolidated [GitHub repo](https://github.com/ZcashFoundation/zfnd/), which publishes directly to [our website](http://zfnd.org).
+
+## Archival date: 1/17/2019
+
 # ZcashFoundation
 
 A non-profit organization serving the Zcash community and promoting financial privacy

VALUES.md

@@ -1,3 +1,7 @@
+## This document has been archived, and will no longer be maintained or updated. The current version can be found in the Zcash Foundation’s new canonical [GitHub repo](https://github.com/ZcashFoundation/zfnd/blob/master/about/values.md), which publishes directly to a corresponding section of our [website](https://www.zfnd.org/about/#values).
+
+## Archival date: 1/17/2019
+
 Values of the Zcash Foundation
 ========