add pre-commit configuration

.editorconfig

@@ -10,3 +10,7 @@ indent_size = tab
 
 [*.{markdown,md}]
 trim_trailing_whitespace = false
+
+[*.{cff,yaml,yml}]
+indent_style = space
+indent_size = 2

.pre-commit-config.yaml

@@ -0,0 +1,23 @@
+# 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: v4.4.0
+    hooks:
+      - id: check-added-large-files
+      - id: check-case-conflict
+      - id: check-executables-have-shebangs
+      - id: check-shebang-scripts-are-executable
+      - id: destroyed-symlinks
+      - id: detect-private-key
+      - id: end-of-file-fixer
+      - id: fix-byte-order-marker
+  - repo: https://github.com/pre-commit/mirrors-prettier
+    rev: "v3.0.0-alpha.6"
+    hooks:
+      - id: prettier
+  - repo: https://github.com/editorconfig-checker/editorconfig-checker.python
+    rev: "2.7.1"
+    hooks:
+      - id: editorconfig-checker
+        alias: ec

README.md

@@ -1,12 +1,12 @@
-*[English](#pirates-in-the-fediverse)*
+_[English](#pirates-in-the-fediverse)_
 
 # Piraatit fediversumissa
 
-*Muista kysyä lupa ennen yksityshenkilön listaamista!*
+_Muista kysyä lupa ennen yksityshenkilön listaamista!_
 
-* `eu.csv` - Euroopan Unionin organisaatioiden ja roolien tunnuksia
-* `organizations.csv` - Piraattijärjestöjen tunnuksia
-* `pirates.csv` - Yksittäisiä piraatteja
+- `eu.csv` - Euroopan Unionin organisaatioiden ja roolien tunnuksia
+- `organizations.csv` - Piraattijärjestöjen tunnuksia
+- `pirates.csv` - Yksittäisiä piraatteja
 
 ## Käyttö
 
@@ -16,11 +16,11 @@
 
 # Pirates in the Fediverse
 
-*Remember to ask for consent before listing individuals.*
+_Remember to ask for consent before listing individuals._
 
-* `eu.csv` - European Union organanizations and roles accounts
-* `organizations.csv` - Accounts belonging to Pirate organizations
-* `pirates.csv` - Individual pirates
+- `eu.csv` - European Union organanizations and roles accounts
+- `organizations.csv` - Accounts belonging to Pirate organizations
+- `pirates.csv` - Individual pirates
 
 ## Usage