Add README.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

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+# Missing Link
+
+A Wikipedia tool that finds articles which mention a topic by name but don't
+link to it, then lets you add the missing wikilink directly from your browser.
+
+Live at: https://edwardbetts.com/missinglink/
+
+## How it works
+
+1. Enter a Wikipedia article title.
+2. The tool searches Wikipedia for articles that mention the title but don't
+   include a wikilink to it.
+3. For each candidate, a diff shows the proposed edit in context.
+4. Save the edit to Wikipedia with one click (requires a Wikipedia account),
+   or skip to the next candidate.
+
+Redirect targets are handled automatically — if the title is a redirect,
+the tool produces a piped link (e.g. `[[Possession of stolen goods|handling stolen goods]]`)
+and excludes articles that already link to the redirect target.
+
+## Setup
+
+### Dependencies
+
+```
+pip install flask requests requests-oauthlib simplejson flipflop
+```
+
+### Configuration
+
+Copy `config/default.py` and add your Wikipedia OAuth credentials:
+
+```python
+SECRET_KEY = 'your-flask-secret-key'
+CLIENT_KEY = 'your-oauth-consumer-key'
+CLIENT_SECRET = 'your-oauth-consumer-secret'
+```
+
+Register an OAuth 1.0a consumer at
+https://meta.wikimedia.org/wiki/Special:OAuthConsumerRegistration/propose
+
+### Running locally
+
+```
+python web_view.py
+```
+
+The app listens on `http://0.0.0.0:8000`.
+
+### Running under Apache mod_fcgid
+
+The `run.fcgi` entry point is used by Apache. Touch it to reload the app
+after code changes:
+
+```
+touch run.fcgi
+```
+
+## Project layout
+
+```
+web_view.py          Flask application and routes
+add_links/
+    api.py           Wikipedia API client (read, search, diff)
+    match.py         Link-finding and wikitext editing logic
+    core.py          Search and candidate ranking
+    mediawiki_oauth.py  OAuth session management
+    mediawiki_api.py    Authenticated write API calls
+templates/           Jinja2 HTML templates
+static/              CSS and assets
+```