chore: linters and security audit tools

Author: maximivanov

.editorconfig

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+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false

.eslintignore

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+public
+node_modules
+package-lock.json

.eslintrc

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+{
+    "extends": ["plugin:prettier/recommended"],
+    "parserOptions": {
+        "ecmaVersion": 2017
+    },
+    "env": {
+        "es6": true
+    }
+}

.markdownlint.json

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+{
+    "MD030": false
+}

.spelling

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+# markdown-spellcheck spelling configuration file
+# Format - lines beginning # are comments
+# global dictionary is at the start, file overrides afterwards
+# one word per line, to define a file override use ' - filename'
+# where filename is relative to this configuration file
+Cloudflare
+ci
+perf

CONTRIBUTING.md

@@ -1,15 +1,76 @@
 # Basic HTTP Authentication Cloudflare worker
 
-Use this worker to password-protect whole websites or just some areas/specific pages.
+Use this worker to password-protect whole websites or some areas/specific pages.
 
 E.g. limit access to a staging version of a static website you're building.
 
 ## Demo
 
 See <https://cloudflareworkers.com/#4796fabd94fb273bc9a7094a40b91d6d:https://tutorial.cloudflareworkers.com>
 
-In this example, to see <https://tutorial.cloudflareworkers.com> you need to pass basic authentication.
+In this example, to see <https://tutorial.cloudflareworkers.com>
+you need to pass basic authentication.
 
 User name: `demouser`
 
 Password: `demopassword`
+
+## Contributing
+
+### Branch Naming
+
+```text
+type/humanFriendlyDescription
+```
+
+Example:
+
+```text
+chore/upgradeLodashToLatestVersion
+```
+
+### Commit Format
+
+Commit message is validated with
+<https://github.com/conventional-changelog/commitlint#readme>
+on commit via git hook.
+
+Message structure must be:
+
+```text
+type(scope?): subject
+```
+
+Valid types are:
+
+- build
+- ci
+- chore
+- docs
+- feat
+- fix
+- perf
+- refactor
+- revert
+- style
+- test
+
+Real world examples can look like this:
+
+```text
+chore: upgrade lodash to latest version
+```
+
+```text
+feat(blog): add comment section
+```
+
+### Code Quality and Security Audit
+
+Your changes will be validated by a CI pipeline anyway,
+but you may want to lint your files and audit packages before pushing:
+
+```sh
+npm run lint
+npm run audit-security
+```

README.md

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+{
+    "moderate": true,
+    "whitelist": ["marked"]
+}

audit-ci.json

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+module.exports = {
+  extends: ['@commitlint/config-conventional'],
+}