Added PR and Issue template. (#505)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Tell us about a problem you are experiencing
+
+---
+
+/kind bug
+
+**What steps did you take and what happened:**
+[A clear and concise description of what the bug is.]
+
+
+**What did you expect to happen:**
+
+
+**Anything else you would like to add:**
+[Miscellaneous information that will assist in solving the issue.]
+
+
+**Environment:**
+
+- Kubeflow version:
+- Minikube version:
+- Kubernetes version: (use `kubectl version`):
+- OS (e.g. from `/etc/os-release`):

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature enhancement request
+about: Suggest an idea for this project
+
+---
+
+/kind feature
+
+**Describe the solution you'd like**
+[A clear and concise description of what you want to happen.]
+
+
+**Anything else you would like to add:**
+[Miscellaneous information that will assist in solving the issue.]

.github/PULL_REQUEST_TEMPLATE.md

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+<!--  Thanks for sending a pull request!  Here are some tips for you:
+1. If this is your first time, read our contributor guidelines https://git.k8s.io/community/contributors/guide/pull-requests.md#the-pull-request-submit-process and developer guide https://git.k8s.io/community/contributors/devel/development.md#development-guide
+2. If you want *faster* PR reviews, read how: https://git.k8s.io/community/contributors/guide/pull-requests.md#best-practices-for-faster-reviews
+3. Follow the instructions for writing a release note: https://git.k8s.io/community/contributors/guide/release-notes.md
+4. If the PR is unfinished, see how to mark it: https://git.k8s.io/community/contributors/guide/pull-requests.md#marking-unfinished-pull-requests
+5. If this PR changes image versions, please title this PR "Bump <image name> from x.x.x to y.y.y."
+-->
+
+**What this PR does / why we need it**:
+
+**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
+Fixes #
+
+**Special notes for your reviewer**:
+
+1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.
+
+**Release note**:
+<!--  Write your release note:
+1. Enter your extended release note in the below block. If the PR requires additional action from users switching to the new release, include the string "action required".
+2. If no release note is required, just write "NONE".
+-->
+```release-note
+
+```