added docs for error tracking

docs/error_tracking.md

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+# Error Tracking Documentation
+
+We use Sentry for real-time error tracking. It tracks errors both on Rails and JS as two separate projects one for backend and front-end.
+
+## Rails Configuration Options
+
+The Rails configuration for Sentry is initialized in the **config/initializers/sentry.rb** file. Here's a brief explanation of the configuration options:
+
+- `config.dsn`: This is the Data Source Name (DSN) for Sentry. If `ENABLE_SENTRY` is **true**, it uses the constant `SENTRY_DSN_RAILS` which stores the client key from sentry for your Rails project. If **false**, it sets the DSN to nil, effectively disabling Sentry.
+
+- `config.breadcrumbs_logger`: This is an array of loggers for breadcrumbs. It currently includes `active_support_logger` and `http_logger`.
+
+- `config.traces_sample_rate`: This sets the rate at which traces are sampled for performance monitoring. If the environment is production, it captures 10% of transactions. Otherwise, it captures 100%.
+
+- `config.send_default_pii`: This is a boolean value that determines whether sensitive information (like user IP, user cookie, request body, query string in the URL) is sent to Sentry. It is currently set to false.
+
+For more configuration options, refer to the [official Sentry documentation](https://docs.sentry.io/platforms/ruby/guides/rails/configuration/options/``). 
+
+## JS Configuration Options
+
+The JavaScript configuration for Sentry is initialized in the **views/layouts/components/_head.html.haml** file. Here's a brief explanation of the configuration options:
+
+- dsn: This is the Data Source Name (DSN) for Sentry. It's set to the value of the constant `SENTRY_DSN_JS` which stores the client key from sentry for your JS project.
+
+- environment: This is set to the current Rails environment.
+
+- integrations: This is an array of integrations to be used with Sentry. Currently, it includes `Sentry.BrowserTracing()` for browser performance tracing.
+
+- tracesSampleRate: This sets the rate at which traces are sampled for performance monitoring. It's currently set to 0.25, meaning 25% of transactions are captured.
+
+For more configuration options, refer to the [official Sentry JavaScript documentation](https://docs.sentry.io/platforms/javascript/configuration/).