[ENH] Adds issue templates for bugs and discussions

.github/ISSUE_TEMPLATE/bug_issue.md

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+---
+name: Bug Issue Template
+about: Bug reporting template
+title: '[BUG]'
+labels: 'bug'
+assignees: ''
+
+---
+
+<!---
+This is a suggested bug issue template for tedana.
+
+If there is other information that would be helpful to include, please don't hesitate to add it!
+-->
+
+<!-- 
+Summarize the bug in 2-3 sentences
+
+Update over time to include what additional discoveries have been made with respect to the bug
+-->
+### Summary
+
+<!-- 
+State functions or programs you suspect may be responsible if applicable
+-->
+### Suspected Cause
+
+<!--
+State the warning or error message if applicable
+-->
+### Warning/Error Message
+
+<!--
+If needed, place additional details below, such as OS, Python version/distribution, etc.
+-->
+### Additional
+
+<!--
+Don't forget to cross-reference other relevant issues via #
+-->

.github/ISSUE_TEMPLATE/discussion_issue.md

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+---
+name: Discussion Issue Template
+about: For discussing high-level decisions and strategy
+title: '[Discussion]'
+labels: 'discussion'
+assignees: ''
+
+---
+
+<!---
+This is a suggested discussion issue template for tedana.
+
+If there is other information that would be helpful to include, please don't hesitate to add it!
+-->
+
+<!-- 
+Summarize the discussion in 2-3 sentences
+
+Update over time to include what additional decisions and points have been made with respect to the discussion
+-->
+### Summary
+
+<!-- 
+States goals you hope to achieve in the discussion
+
+List them as items via *
+-->
+### Goals
+* 
+
+<!--
+(OPTIONAL)
+State strategy if this discussion is about a high-level decision. 
+
+If the strategy is in ordered steps or has prioritization,
+Use markdown numbering by starting with 1. 
+Otherwise, use unordered item markers via *
+-->
+### Strategy
+1. 
+*
+
+<!--
+If desired, place additional notes below in paragraph format
+-->
+### Additional
+
+<!--
+Don't forget to cross-reference other relevant issues or discussions via #
+-->