Update issue templates

Set up issue templates

.github/ISSUE_TEMPLATE/compile-issue.md

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+---
+name: Compile issue
+about: Report / ask about a compilation issue
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+# Common issues
+
+**Problem**: `rand_hc::Hc128Rng: rand_core::SeedableRng` (or other RNG)
+
+**Quick solution**: `cargo update`
+
+**Details**: This happens when multiple versions of the `rand_core` crate are in use. Check your `Cargo.lock` file for all versions of `rand_core`. Note that some versions (0.2.2 and 0.3.1) are compatibility shims and are not a problem by themselves.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Background
+
+**What is your motivation?**
+
+**What type of application is this?** (E.g. cryptography, game, numerical simulation)
+
+## Feature request
+
+<details here>

.github/ISSUE_TEMPLATE/other.md

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+---
+name: Other
+about: empty template
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+