Add deprecation notices, deprecation warning on install

CHANGELOG.md

@@ -4,7 +4,8 @@ All notable changes to the IBM® IMS™ Plug-in for Zowe CLI will be documented
 
 ## Recent Changes
 
-- BugFix: Add missing npm-shrinkwrap
+- Deprecated: Added deprecation notices
+- BugFix: Added missing npm-shrinkwrap
 
 ## `2.0.4`
 

README.md

@@ -1,5 +1,7 @@
 # IBM® IMS™ Plug-in for Zowe CLI <!-- omit in toc -->
 
+### The IBM® IMS™ Plug-in for Zowe CLI is deprecated, and will not receive additional security updates, bug fixes, or enhancements.
+
 [![codecov](https://codecov.io/gh/zowe/zowe-cli-ims-plugin/branch/master/graph/badge.svg)](https://codecov.io/gh/zowe/zowe-cli-ims-plugin)
 
 The IBM IMS Plug-in for Zowe CLI lets you extend Zowe CLI to interact with IMS resources (programs and transactions). You can use the plug-in to create new IMS applications or update existing IMS applications. For more information about IMS, see [IBM Information Management System (IMS)](https://www.ibm.com/it-infrastructure/z/ims).

package.json

@@ -35,6 +35,7 @@
     "lint": "eslint \"src/**/*.ts\" \"**/__tests__/**/*.ts\"",
     "lint:src": "eslint \"src/**/*.ts\" --ignore-pattern \"**/__tests__/**/*.ts\"",
     "lint:tests": "eslint \"**/__tests__/**/*.ts\"",
+    "postinstall": "echo \"The IBM® IMS™ Plug-in for Zowe CLI is deprecated, and will not receive additional security updates, bug fixes, or enhancements.\" 1>&2",
     "test": "npm run test:unit && npm run test:system",
     "test:system": "env-cmd __tests__/__resources__/env/system.env jest .*/__system__/.* --coverage false --runInBand",
     "test:integration": "env-cmd __tests__/__resources__/env/integration.env jest .*/__integration__/.* --coverage false",