add troubleshooting and faq

Author: SMILEY4

docs/assets/stylesheets/extra.css

@@ -27,5 +27,9 @@ details code {
 }
 
 .md-typeset h3 {
-  margin-top: 1.2em;
+    margin-top: 2.2em;
+}
+
+.md-content {
+    padding-bottom: 7em;
 }

docs/openapi/troubleshooting_and_faq.md

@@ -1,3 +1,114 @@
 # Troubleshooting & FAQ
 
-todo
+
+## Plugin Configuration
+
+### Rate Limit Plugin Routes Appearing Incorrectly
+
+Routes wrapped with `rateLimit` appear as `/(RateLimit test)/endpoint` instead of `/endpoint`.
+
+**Possible Solution**
+
+Add the rate limit route selector to the ignored list:
+
+```kotlin
+install(OpenApi) {
+    ignoredRouteSelectors += RateLimitRouteSelector::class
+}
+```
+
+
+### Resources Plugin Not Installed Error
+
+Error when using type-safe routing: `Application plugin Resources is not installed`.
+
+**Possible Solution**
+
+The OpenAPI plugin doesn't automatically install the Resources plugin.
+
+Install the Resources plugin explicitly before the OpenAPI plugin:
+
+```kotlin
+install(Resources) // (1)!
+install(OpenApi) {
+    autoDocumentResourcesRoutes = true
+}
+```
+
+1. Must be installed separately
+
+
+
+
+## Schema Generation
+
+
+### Swagger Annotations Not Appearing in Generated Schemas
+
+Using `@Schema` annotations from Swagger with `SchemaGenerator.kotlinx()`, but descriptions and other annotation values don't appear in the generated specification.
+
+**Possible Solution**
+
+Swagger annotations are not supported by kotlinx.serialization due to how annotations are processed during compilation. Use the matching annotations from schema-kenerator-core instead:
+
+```kotlin
+import io.github.smiley4.schemakenerator.core.annotations.Description
+
+@Serializable
+data class User(
+    @Description("Unique user identifier")
+    val id: String,
+    @Description("User's display name")
+    val name: String
+)
+```
+
+
+
+
+### Schema Overwrites Not Taking Effect with Kotlinx.Serialization
+
+Configured a SchemaOverwriteModule but the custom schema doesn't appear in the specification.
+
+**Possible Solution**
+
+The identifier in the overwrite module must match the serial descriptor name used by your custom serializer, not necessarily the qualified class name.
+
+Ensure the identifier matches your serializer's descriptor name:
+
+```kotlin
+// Custom serializer
+object InstantSerializer : KSerializer<Instant> {
+    override val descriptor: SerialDescriptor = 
+        PrimitiveSerialDescriptor("Instant", PrimitiveKind.STRING) // (1)!
+}
+
+// Overwrite module - identifier must match
+object InstantOverwrite : SchemaOverwriteModule(
+    identifier = "Instant", // (2)!
+    schema = {
+        Schema<Any>().also {
+            it.types = setOf("string")
+            it.format = "date-time"
+        }
+    }
+)
+```
+
+1. Serial name defined in custom serializer
+2. Identifier must match the serial name exactly
+
+
+
+
+## Authentication and Security
+
+### Cookie Authentication Not Working in Swagger UI
+
+Cookie authentication configured but "Try it out" doesn't include the Cookie header.
+
+**Possible Solution**
+
+This is a limitation of Swagger UI, not the plugin. Swagger UI does not support cookie authentication in its "Try it out" feature.
+
+Reference: [Swagger UI Cookie Authentication Documentation](https://swagger.io/docs/specification/v3_0/authentication/cookie-authentication/)