ci: add issue templates (#28)

Author: juliapampus

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Create a report to help us improve
+title: ''
+labels: [ "bug_report", "triage" ]
+assignees: ''
+
+---
+
+# Bug Report
+
+## Describe the Bug
+
+_A clear and concise description of the bug._
+
+**Type**: `normative` / `non-normative` _<-- please specify the affected scope_
+
+### Expected Behavior
+
+_A clear and concise description of what you expected to happen._
+
+### Observed Behavior
+
+_A clear and concise description of what happened instead._
+
+### Detailed Description
+
+_If applicable, add some context information to help explain your problem._
+
+## Possible Implementation
+
+_You already know the root cause of the erroneous state and how to fix it? Feel free to share your thoughts._

.github/ISSUE_TEMPLATE/config.yml

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+---
+blank_issues_enabled: false
+contact_links:
+  - name: Ask a question or get support
+    url: https://github.com/eclipse-dataspace-protocol-base/DataspaceProtocol/discussions
+    about: Ask a question or request support for using the Dataspace Protocol
+  - name: Take a look at the best practices
+    url: https://github.com/eclipse-dataspace-protocol-base/dsp_best_practices
+    about: Browse the best practices documents for more information

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature Request
+about: Help us with new ideas
+title: ''
+labels: [ "feature_request", "triage" ]
+assignees: ''
+
+---
+
+# Feature Request
+
+_If you are missing a feature or have an idea how to improve this project that should first be discussed, please feel free to open up a [discussion](https://github.com/eclipse-dataspace-protocol-base/DataspaceProtocol/discussions/new)._
+
+## Which Areas Would Be Affected?
+
+_e.g., data offering, policy negotiation, data transfer, etc._
+
+**Type**: `normative` / `non-normative` _<-- please specify the affected scope_
+
+## Why Is the Feature Desired?
+
+_Are there any requirements?_
+
+## Solution Proposal
+
+_If possible, provide a (brief!) solution proposal._