Add issue templates for geos-chem-cloud repo

Added Github issue templates for:
(1) Asking a question
(2) Reporting a bug or technical issue
(3) Requesting a feature

Signed-off-by: Bob Yantosca <yantosca@seas.harvard.edu>

.github/ISSUE_TEMPLATE/ask-a-question-about-geos-chem.md

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+---
+name: Ask a question about GEOS-Chem on the AWS cloud
+about: Template for asking general questions about GEOS-Chem on the AWS cloud
+title: "[QUESTION]"
+labels: ''
+assignees: ''
+
+---
+
+# Ask a question about GEOS-Chem on the cloud
+
+To report a bug or technical issue, please use [this issue template](https://github.com/geoschem/geos-chem-cloud/issues/new?assignees=&labels=&template=report-a-bug-or-technical-issue.md&title=%5BBUG%2FISSUE%5D) instead.
+
+## Type your question:
+
+Feel free to delete all of the text above this line...

.github/ISSUE_TEMPLATE/report-a-bug-or-technical-issue.md

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+---
+name: Report a bug or technical issue
+about: This template allows users to report bugs and technical issues for GEOS-Chem on the AWS Cloud in the Github issue tracker.
+title: "[BUG/ISSUE]"
+labels: ''
+assignees: ''
+
+---
+
+# Report a bug or technical issue for GEOS-Chem running on the AWS cloud
+
+## Describe the bug
+Include a clear and concise description of the bug or issue that you have encountered.
+
+## To Reproduce
+Include the steps that must be done in order to reproduce the observed behavior:
+
+**Compilation commands**
+1. Step 1
+2. Step 2
+3. ... etc ...
+
+**Run commands**
+1. Step 1
+2. Step 2
+3. ... etc ...
+
+## Expected behavior
+Include a clear and concise description of what you expected to happen.
+
+## Error messages
+```
+Cut and paste any error output here.
+```
+
+## Required information
+Please include the following:
+ - GEOS-Chem version you are using [e.g. 12.3.2]
+ - Compiler version that you are using [e.g. gfortran 8.2.0, ifort 17.0.4] 
+ - netCDF and netCDF-Fortran library version
+ - Computational environment [e.g. a cluster, or the AWS cloud]
+ - The Amazon Machine Image (AMI) ID that you used
+ - Are you using "out of the box" code, or have you made modifications?
+
+## Input and log files to attach
+For more info, see: http://wiki.geos-chem.org/Submitting_GEOS-Chem_support_requests
+ - The lastbuild file
+ - The input.geos file
+ - The HEMCO_Config.rc file
+ - The GEOS-Chem "Classic" log file
+ - The HEMCO.log file
+ - Error output from your scheduler, if applicable [e.g. slurm*.out]
+ - Any other error messages
+
+## Additional context
+Include any other context about the problem here.

.github/ISSUE_TEMPLATE/request-a-new-feature.md

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+---
+name: Request a new GEOS-Chem feature
+about: Template for users to request new features in GEOS-Chem on the AWS cloud
+title: "[FEATURE REQUEST]"
+labels: ''
+assignees: ''
+
+---
+
+## Add your feature request below: