[doc] Add github issue templates

Refs #2249

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,20 +1,39 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
 <!-- Please, prefix the report title with the language it applies to within brackets, such as [java] or [apex].
 If not specific to a language, you can use [core]. -->
 
-<!-- NB: issues about the rule designer should be opened at https://github.com/pmd/pmd-designer/issues -->
-
 **Affects PMD Version:** 
 
-**Rule:**
+Make sure, to test with the latest PMD version.
 
 **Description:**
 
+A clear and concise description of what the bug is.
+
+**Exception Stacktrace:**
+
+```
+# Copy-paste the stack trace here
+```
+
 **Code Sample demonstrating the issue:**
 
 ```
 
 ```
 
+**Steps to reproduce:**
+
+1.  Compile the project: `mvn verify`
+2.  Run PMD: `run.sh pmd -d src -f xml -R ruleset.xml`
+
 **Running PMD through:** *[CLI | Ant | Maven | Gradle | Designer | Other]*
 
 <!-- If relevant, also include your JDK and OS information, e.g. for ClassNotFoundException, LinkageError, reflection failures, etc. -->

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,8 @@
+blank_issues_enabled: false
+contact_links:
+  - name: PMD Designer Issues
+    url: https://github.com/pmd/pmd-designer/issues
+    about: Issues about the rule designer
+  - name: PMD Eclipse Plugin Issues
+    url: https://github.com/pmd/pmd-eclipse-plugin/issues
+    about: Issues about the PMD Eclipse Plugin

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,20 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context about the feature request here.

.github/ISSUE_TEMPLATE/new_rule.md

@@ -0,0 +1,27 @@
+---
+name: New Rule
+about: You have an idea for a new rule? Great!
+title: ''
+labels: new-rule
+assignees: ''
+
+---
+<!-- Please, prefix the report title with the language it applies to within brackets, such as [java] or [apex] -->
+
+**Proposed Rule Name:**
+
+**Proposed Category:** One of [Best Practices | Code Style | Design | Documentation | Error Prone | Multithreading | Performance | Security]
+
+**Description:**
+
+**Code Sample:** This should include code, that should be flagged by the rule. If possible, the "correct" code
+according to this new rule should also be demonstrated.
+
+```
+
+```
+
+**Possible Properties:**
+
+*   Should this rule be customizable via properties?
+

.github/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,14 @@
+---
+name: Question
+about: Feel free to ask any question about PMD and its usage
+title: ''
+labels: question
+assignees: ''
+
+---
+
+<!-- Have a look at https://github.com/pmd/pmd/issues?utf8=%E2%9C%93&q=label%3Aa%3Aquestion if there is already
+a similar question -->
+
+**Description:**
+

.github/ISSUE_TEMPLATE/rule_violation.md

@@ -0,0 +1,29 @@
+---
+name: Rule violation
+about: Let us know about a false positive/false negative
+title: ''
+labels: bug
+assignees: ''
+
+---
+<!-- Please, prefix the report title with the language it applies to within brackets, such as [java] or [apex] -->
+
+**Affects PMD Version:** 
+
+**Rule:**
+
+**Description:**
+
+**Code Sample demonstrating the issue:**
+
+```
+
+```
+
+**Expected outcome:**
+
+*   Does PMD report a violation, where there shouldn't be one? -> false-positive
+*   Is PMD missing to report a violation, where there should be one? -> false-negative
+
+
+**Running PMD through:** *[CLI | Ant | Maven | Gradle | Designer | Other]*