Add pre-commit

.gitignore

@@ -1 +1 @@
-alarm_bot
+alarm_bot

.pre-commit-config.yaml

@@ -0,0 +1,15 @@
+# See https://pre-commit.com for more information
+# See https://pre-commit.com/hooks.html for more hooks
+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-added-large-files
+-   repo: https://github.com/TekWizely/pre-commit-golang
+    rev: v0.8.3
+    hooks:
+    -   id: go-fmt
+        args: [ -w ]
+    -   id: go-vet