Add a pre-commit config file

The easiest way to install these pre-commit hooks is by running
`pip install --user pre-commit && pre-commit install`

The current checks are quite basic and only check that the changed files
don't have trailing whitespace and have valid line endings.

.pre-commit-config.yaml

@@ -0,0 +1,14 @@
+# See https://pre-commit.com for more information
+# See https://pre-commit.com/hooks.html for more hooks
+exclude: "^sail_latex_riscv/.*"
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v3.2.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: check-yaml
+      - id: check-added-large-files
+      - id: mixed-line-ending
+        args: [ "--fix=lf" ]
+      - id: check-case-conflict