add stalebot, add welcome message, add PR template

Signed-off-by: morrme <morrme@users.noreply.github.com>

Author: morrme

.github/PULL_REQUEST_TEMPLATE.md

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+**Description**
+
+This PR fixes #
+
+**Notes for Reviewers**
+
+
+**[Signed commits](../CONTRIBUTING.md#signing-off-on-commits-developer-certificate-of-origin)**
+- [ ] Yes, I signed my commits.
+ 
+
+<!--
+Thank you for contributing to Meshery! 
+
+Contributing Conventions:
+
+1. Include descriptive PR titles with [<component-name>] prepended.
+2. Build and test your changes before submitting a PR. 
+3. Sign your commits
+
+By following the community's contribution conventions upfront, the review process will 
+be accelerated and your PR merged more quickly.
+-->

.github/config.yml

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+#-------------------------------------------------------------------------------
+# Configuration for new-issue-welcome - https://github.com/behaviorbot/new-issue-welcome
+ # Comment to be posted to on first time issues
+newIssueWelcomeComment: >
+   Thanks for opening this issue. A contributor will be by to give feedback soon. In the meantime, please review the [Layer5 Community Welcome Guide](https://docs.google.com/document/d/17OPtDE_rdnPQxmk2Kauhm3GwXF1R5dZ3Cj8qZLKdo5E/edit?usp=sharing) and sure to join the [community Slack](http://slack.layer5.io/).
+ # Configuration for new-pr-welcome - https://github.com/behaviorbot/new-pr-welcome
+ # Comment to be posted to on PRs from first time contributors in your repository
+newPRWelcomeComment: >
+   Yay, your first pull request! :thumbsup: A contributor will be by to give feedback soon. In the meantime, please review the [Layer5 Community Welcome Guide](https://docs.google.com/document/d/17OPtDE_rdnPQxmk2Kauhm3GwXF1R5dZ3Cj8qZLKdo5E/edit?usp=sharing) and sure to join the [community Slack](http://slack.layer5.io/).
+
+   Be sure to double-check that you have signed your commits. Here are instructions for [making signing an implicit activity while peforming a commit](../CONTRIBUTING.md#signing-off-on-commits-developer-certificate-of-origin).
+
+
+#-------------------------------------------------------------------------------
+# Configuration for first-pr-merge - https://github.com/behaviorbot/first-pr-merge
+# Comment to be posted to on pull requests merged by a first time user
+firstPRMergeComment: >
+  Thanks for your contribution to the Layer5 community! :tada:
+   
+  ![Congrats!](welcome/Layer5-celebration.png)
+
+
+#-------------------------------------------------------------------------------
+# Configuration for request-info - https://github.com/behaviorbot/request-info
+# Comment to reply with
+requestInfoReplyComment: >
+  Thanks for opening this issue. We welcome all input! If you could provide a little more information, this will greatly aid in its resolution. :thumbsup:
+# *OPTIONAL* Add a list of people whose Issues/PRs will not be commented on
+# keys must be GitHub usernames
+#requestInfoUserstoExclude:
+#  - layer5io/maintainers
+
+
+#-------------------------------------------------------------------------------
+# Configuration for sentiment-bot - https://github.com/behaviorbot/sentiment-bot
+# *Required* toxicity threshold between 0 and .99 with the higher numbers being the most toxic
+# Anything higher than this threshold will be marked as toxic and commented on
+sentimentBotToxicityThreshold: .9
+
+# *Required* Comment to reply with
+sentimentBotReplyComment: >
+  Please be sure to review the code of conduct and be respectful of other users. // @layer5io/maintainers 
+  

.github/stale.yml

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+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 45
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 10
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - issue/willfix
+# Label to use when marking an issue as stale
+staleLabel: issue/stale
+# Comment to post when marking an issue as stale. Set to `false` to disable
+markComment: >
+  This issue has been automatically marked as stale because it has not had
+  recent activity. It will be closed if no further activity occurs. Thank you
+  for your contributions.
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: >
+  This issue is being automatically closed due to inactivity.
+  However, you may choose to reopen this issue.