Adding owners, codeowners and templates (#2)

* Adding owners and codeowners

Signed-off-by: Ricardo Zanini <zanini@redhat.com>

* Adding templates

Signed-off-by: Ricardo Zanini <zanini@redhat.com>

Author: ricardozanini

.github/CODEOWNERS

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+*       @tsurdilo @ricardozanini

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Report a bug encountered with the Serverless Workflow Go SDK
+labels: "bug :bug:"
+
+---
+
+**What happened**:
+
+**What you expected to happen**:
+
+**How to reproduce it**:
+
+**Anything else we need to know?**:
+
+**Environment**:
+- Specification version used:
+<!-- Run `go version` in your terminal -->
+- Go version:
+

.github/ISSUE_TEMPLATE/enhancement.md

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+---
+name: Enhancement Request
+about: Suggest an enhancement to the Go SDK Serverless Workflow
+labels: "enhancement :pray:"
+
+---
+
+**What would you like to be added**:
+
+**Why is this needed**:

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask a question about the Go SDK Serverless Workflow
+labels: "question :question:"
+
+---
+
+**What is the question**:

.github/OWNERS

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+reviewers:
+  - tsurdilo
+  - ricardozanini
+approvers:
+  - tsurdilo
+  - ricardozanini

.github/PULL_REQUEST_TEMPLATE.md

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+**Many thanks for submitting your Pull Request :heart:!**
+
+**What this PR does / why we need it**:
+
+**Special notes for reviewers**:
+
+**Additional information (if needed):**