Add issue templates (#105)

Author: ota-meshi

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+---
+
+<!--
+  Before posting the issue, please confirm that the problem you're getting
+  is not related with your code editor configuration.
+  To make sure it's not, run: yarn eslint src/your-file.vue
+-->
+
+**Tell us about your environment**
+
+- **ESLint version:**
+- **eslint-plugin-vue version:**
+- **eslint-plugin-vue-i18n version:**
+- **Node version:**
+
+**Please show your full configuration:**
+<!-- Paste content of your .eslintrc file -->
+```json5
+
+```
+
+**What did you do?**
+<!-- Please include the actual source code causing the issue. -->
+```vue
+
+```
+
+**What did you expect to happen?**
+
+
+**What actually happened?**
+<!--
+  Please include the actual, raw output from ESLint.
+  If you are only looking at the results of your editor extension, also check the CLI results.
+-->
+

.github/ISSUE_TEMPLATE/change.md

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+---
+name: "Non-rule change request"
+about: Request a change that is not a bug fix, rule change, or new rule
+---
+
+<!--
+  Before proposing changes, please make sure it hasn't been posted already.
+  You can see all open propositions here:
+  https://github.com/intlify/eslint-plugin-vue-i18n/issues?q=is%3Aissue+is%3Aopen+label%3A%22Type%3A+Feature%22
+-->
+
+**Tell us about your environment**
+
+- **ESLint version:**
+- **eslint-plugin-vue version:**
+- **eslint-plugin-vue-i18n version:**
+- **Node version:**
+
+**The problem you want to solve.**
+
+
+**Your take on the correct solution to problem.**
+
+
+**Additional context**
+<!-- Add any other context or screenshots about the feature request here. -->
+

.github/ISSUE_TEMPLATE/rule-change.md

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+---
+name: "Rule change request"
+about: Request a change to an existing rule
+---
+
+<!--
+  Before proposing rule changes, please make sure it hasn't been posted already.
+  You can see all open propositions here:
+  https://github.com/intlify/eslint-plugin-vue-i18n/issues?q=is%3Aissue+is%3Aopen+label%3A%22Type%3A+Feature%22
+-->
+
+**What rule do you want to change?**
+
+**Does this change cause the rule to produce more or fewer warnings?**
+
+**How will the change be implemented? (New option, new default behavior, etc.)?**
+
+**Please provide some example code that this change will affect:**
+
+<!-- Put your code examples here -->
+```vue
+
+```
+
+**What does the rule currently do for this code?**
+
+**What will the rule do after it's changed?**
+
+**Additional context**
+<!-- Add any other context or screenshots about the feature request here. -->
+

.github/ISSUE_TEMPLATE/rule-proposal.md

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+---
+name: Rule Proposal
+about: Suggest an idea for a new rule
+---
+
+<!--
+  Before proposing new rule, please make sure it hasn't been posted already.
+  You can see all open propositions here:
+  https://github.com/intlify/eslint-plugin-vue-i18n/issues?q=is%3Aissue+is%3Aopen+label%3A%22Type%3A+Feature%22
+-->
+
+**Please describe what the rule should do:**
+<!-- A clear and concise description of what the rule should do. -->
+
+**What category should the rule belong to?**
+<!-- (place an "X" next to just one item) -->
+[ ] Enforces code style (layout)
+[ ] Warns about a potential error (problem)
+[ ] Suggests an alternate way of doing something (suggestion)
+[ ] Other (please specify:)
+
+**Provide 2-3 code examples that this rule should warn about:**
+
+```vue
+
+```
+
+**Additional context**
+<!-- Add any other context or screenshots about the feature request here. -->
+