Ask for more information in bug reports

People are filing bug reports without providing us basic info like the
qsim version. This adds an additional question to ask for the version
number. It also adds a suggestion to search existing issues, and tweaks
the form a little bit in other ways.

Author: mhucka

.github/ISSUE_TEMPLATE/1-bug-report.yml

@@ -5,33 +5,75 @@ body:
   - type: markdown
     attributes:
       value: |
-        Thank you for taking the time to fill out this bug report!
+        Thank you for making the effort to open an issue report. Before
+        continuing, it's worth [searching through the existing issues in this
+        repository](https://github.com/quantumlib/qsim/issues?q=is%3Aissue) in
+        case the same issue has already been asked and possibly answered.
 
   - type: textarea
     attributes:
       label: Describe the issue
       description: >-
-        Please explain clearly and in detail what the issue is. What led up
-        to it, or how did you encounter it?
+        Please explain clearly and in detail what the issue is. How did you
+        encounter it? What were you trying to do?
     validations:
       required: true
 
   - type: input
     attributes:
-      label: What version of qsim are you using?
+      label: Tell us the version of qsim or qsimcirq you are using
+      description: >-
+        If the problem involves a qsim/qsimcirq error or behavior, it is vital
+        that we know the version installed in your computing environment. This
+        can be determined in more than one way.
+
+        **In a terminal:**
+
+        If you are using the Python package (`qsimcirq`) and are running within
+        a terminal emulator, then typing the following command in the shell will
+        print the version number:
+
+        ```shell
+        python3 -c 'import qsimcirq; print(qsimcirq.__version__)'
+        ```
+
+        **In a Colab or Jupyter notebook:**
+
+        If you are using the `qsimcirq` package in a Google Colab or Jupyter
+        notebook, then running the following command will print the version
+        number:
+
+        ```python
+        import qsimcirq; print(qsimcirq.__version__)
+        ```
+    validations:
+      required: false
+
+  - type: input
+    attributes:
+      label: Tell us about the computing environment you are using
+      description: >-
+        To investigate the cause of the problem, we will also need to know the
+        computing environment you are using. Please tell us if you are using
+        Linux, macOS, Windows, Google Colab, or something else. If it is a
+        Linux/Mac/Windows environment, please also tell us its version.
     validations:
       required: false
 
   - type: textarea
     attributes:
-      label: How can the issue be reproduced?
+      label: Tell us how the issue can be reproduced
       description: >-
-        Explain in a step-by-step fashion what someone else would need to
+        Explain in a step-by-step fashion what someone else will need to
         do in order to reproduce the issue. If possible, include literal
         examples of commands or code using [Markdown fenced code
         blocks](https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-and-highlighting-code-blocks).
         For long output, paste the text into [collapsed
         sections](https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/organizing-information-with-collapsed-sections)
         or attach text files.
+      placeholder: |
+        1. …
+        2. …
+        3. …
     validations:
       required: false