updated README and added issue templates for autocert

.github/ISSUE_TEMPLATE/autocert_bug.md

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+---
+name: Autocert Bug
+about: Report a bug you found in autocert
+labels: area/autocert bug
+---
+
+### Subject of the issue
+Describe your issue here
+
+### Environment
+* Kubernetes version:
+* Cloud provider or hardware configuration:
+* OS (e.g., from /etc/os-release):
+* Kernel (e.g., `uname -a`):
+* Install tools:
+* Other:
+
+### Steps to reproduce
+Tell us how to reproduce this issue
+
+### Expected behaviour
+Tell us what should happen
+
+### Actual behaviour
+Tell us what happens instead
+
+### Additional context
+Add any other context about the problem here

.github/ISSUE_TEMPLATE/autocert_enhancement.md

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+---
+name: Autocert Enhancement
+about: Suggest an enhancement to autocert
+labels: area/autocert enhancement
+---
+
+### What would you like to be added
+
+
+### Why this is needed
+