Add CI pipelines and pre-commit hooks

Now we have a very basic CI pipeline for running tests and executing
linter, as well as a pre-commit hook that is checking basic code related
stuff. The pre-commit hook is executed as a part of pipelines as well

Signed-off-by: Nikolai Rodionov <allanger@badhouseplants.net>

.pre-commit-config.yaml

@@ -0,0 +1,12 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.3.0
+    hooks:
+      - id: check-added-large-files
+      - id: check-merge-conflict
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
+  - repo: https://github.com/codespell-project/codespell
+    rev: v2.4.1
+    hooks:
+      - id: codespell