add planned deprecation notice [#158045374]

Signed-off-by: JT Archie <jarchie@pivotal.io>

README.md

@@ -1,3 +1,11 @@
+### Planned Deprecation
+Please note that this repository will be officially deprecated soon.
+New and better tools to replace this repo are under development.
+While you are welcome to raise issues and pull requests,
+not every issue will be prioritized.
+
+### Description
+
 This is a collection of [Concourse](https://concourse-ci.org) pipelines for
 installing and upgrading [Pivotal Cloud Foundry](https://pivotal.io/platform).
 
@@ -12,7 +20,7 @@ Other pipelines which may be of interest are listed at the end of this README.
 
 If you do not have access to the Pivotal Network release, and you are using the GitHub release, for stability, please ensure you are tagging the pipeline.yml:
 
-```
+```yaml
  resources:
   - name: pcf-pipelines
   type: git

docs/ISSUE_TEMPLATE.md

@@ -1,4 +1,10 @@
-Thanks for submitting an issue to pcf-pipelines. To help us triage the issue, please fill out the following form as much as you can:
+Thanks for submitting an issue to pcf-pipelines.
+Please note that this repository will be officially deprecated soon.
+New and better tools to replace this repo are under development.
+While you are welcome to raise issues,
+not every issue will be prioritized.
+
+To help us triage the issue, please fill out the following form as much as you can:
 
 ## Issue
 

docs/PULL_REQUEST_TEMPLATE.md

@@ -1,4 +1,10 @@
-Thanks for contributing to pcf-pipelines. To speed up the process of reviewing your pull request please provide us with:
+Thanks for submitting an pull request to pcf-pipelines.
+Please note that this repository will be officially deprecated soon.
+New and better tools to replace this repo are under development.
+While you are welcome to raise pull requests,
+not every issue will be prioritized.
+
+To speed up the process of reviewing your pull request please provide us with:
 
 * A short explanation of the proposed change: