Update issue templates (#2295)

* Update issue templates

* Update templates

.github/ISSUE_TEMPLATE/bugs.md

@@ -0,0 +1,15 @@
+---
+name: "\U0001F6A8 Bug Report"
+about: Did you come across a bug or unexpected behaviour differing from the docs?
+
+---
+
+## How to reproduce the behaviour
+<!-- Include a code example or the steps that led to the problem. Please try to be as specific as possible. -->
+
+## Your Environment
+<!-- Include details of your environment. If you're using spaCy 1.7+, you can also type `python -m spacy info --markdown` and copy-paste the result here.-->
+* Operating System:
+* Python Version Used:
+* spaCy Version Used:
+* Environment Information:

.github/ISSUE_TEMPLATE/docs.md

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+---
+name: "\U0001F4DA Documentation"
+about: Did you spot a mistake in the docs, is anything unclear or do you have a
+  suggestion?
+
+---
+<!-- Describe the problem or suggestion here. If you've found a mistake and you know the answer, feel free to submit a pull request straight away: https://github.com/explosion/spaCy/pulls -->
+
+## Which page or section is this issue related to?
+<!-- Please include the URL and/or source. -->

.github/ISSUE_TEMPLATE/install.md

@@ -0,0 +1,21 @@
+---
+name: "\U000023F3 Installation Problem"
+about: Do you have problems installing spaCy, and none of the suggestions in the docs
+  and other issues helped?
+
+---
+<!-- Before submitting an issue, make sure to check the docs and closed issues to see if any of the solutions work for you. Installation problems can often be related to Python environment issues and problems with compilation. -->
+
+## How to reproduce the problem
+<!-- Include the details of how the problem occurred. Which command did you run to install spaCy? Did you come across an error? What else did you try? -->
+
+```bash
+# copy-paste the error message here
+```
+
+## Your Environment
+<!-- Include details of your environment. If you're using spaCy 1.7+, you can also type `python -m spacy info --markdown` and copy-paste the result here.-->
+* Operating System:
+* Python Version Used:
+* spaCy Version Used:
+* Environment Information:

.github/ISSUE_TEMPLATE/other.md

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+---
+name: "\U0001F4AC Anything else?"
+about: For general usage questions or help with your code, please consider
+  posting on StackOverflow instead.
+
+---
+
+<!-- Describe your issue here. Please keep in mind that the GitHub issue tracker is mostly intended for reports related to the spaCy code base and source, and for bugs and feature requests. If you're looking for help with your code, consider posting a question on StackOverflow instead: http://stackoverflow.com/questions/tagged/spacy -->
+
+## Your Environment
+<!-- Include details of your environment. If you're using spaCy 1.7+, you can also type `python -m spacy info --markdown` and copy-paste the result here.-->
+* Operating System:
+* Python Version Used:
+* spaCy Version Used:
+* Environment Information:

.github/ISSUE_TEMPLATE/request.md

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+---
+name: "\U0001F381 Feature Request"
+about: Do you have an idea for an improvement, a new feature or a plugin?
+
+---
+
+## Feature description
+<!-- Please describe the feature: Which area of the library is it related to? What specific solution would you like? -->
+
+## Could the feature be a [custom component](https://spacy.io/usage/processing-pipelines#custom-components) or [spaCy plugin](https://spacy.io/universe)?
+If so, we will tag it as [`project idea`](https://github.com/explosion/spaCy/labels/project%20idea) so other users can take it on.