docs: Add .Net caching to docs

docs/docs/clients/server-side.md

@@ -1066,6 +1066,7 @@ private static FlagsmithClient flagsmith = FlagsmithClient
 
     // Enable in-memory caching for the Flagsmith API.
     // Optional.
+    // See Caching section below for more details.
     // Defaults to not cache anything.
     .withCache(FlagsmithCacheConfig.builder().enableEnvLevelCaching("cache-key").build())
 
@@ -1156,36 +1157,41 @@ _flagsmithClient = new FlagsmithClient(
     # Override the default Flagsmith API URL if you are self-hosting.
     # Optional.
     # Defaults to https://edge.api.flagsmith.com/api/v1/
-    apiUrl: "https://flagsmith.myproject.com"
+    apiUrl: "https://flagsmith.myproject.com",
 
     # Controls which mode to run in; local or remote evaluation.
     # See the `SDKs Overview Page` for more info
     # Optional.
     # Defaults to False.
-    enableClientSideEvaluation: false;
+    enableClientSideEvaluation: false,
 
     # Controls whether Flag Analytics data is sent to the Flagsmith API
     # See https://docs.flagsmith.com/advanced-use/flag-analytics
     # Optional
     # Defaults to false
-    enableAnalytics: false
+    enableAnalytics: false,
 
     # When running in local evaluation mode, defines
     # how often to request an updated Environment document in seconds
     # Optional
     # Defaults to 60 seconds
-    environmentRefreshIntervalSeconds: 60
+    environmentRefreshIntervalSeconds: 60,
+
+    # Enables caching support.
+    # See Caching section below for more details.
+    # Optional.
+    cacheConfig: new CacheConfig(true),
 
     # You can pass custom headers to the Flagsmith API with this Dictionary.
     # This can be helpful, for example, when sending request IDs to help trace requests.
     # Optional
     # Defaults to None
-    customHeaders: <Dictionary>
+    customHeaders: <Dictionary>,
 
     # How often to retry failed HTTP requests
     # Optional
     # Defaults to 1
-    retries: 1
+    retries: 1,
 
     # The network timeout in seconds.
     # Optional.
@@ -1342,7 +1348,7 @@ const flagsmith = new Flagsmith({
  /*
    Adds caching support
    Optional
-   See https://docs.flagsmith.com/clients/server-side#caching
+   See Caching section below for more details.
    */
  cache: {
   has: (key: string) => bool,
@@ -1754,6 +1760,29 @@ cache.invalidate(projectLevelCacheKey);
 final FlagsAndTraits flags = cache.getIfPresent(projectLevelCacheKey);
 ```
 
+</TabItem>
+<TabItem value="dotnet" label=".NET">
+
+To enable caching, you can initialise the SDK like this:
+
+```csharp
+var flagsmithClient = new FlagsmithClient(Fixtures.ApiKey,
+    httpClient: mockHttpClient.Object,
+    enableClientSideEvaluation: true,
+    cacheConfig: new CacheConfig(true));
+```
+
+If the cacheConfig argument is passed during initialization with its `Enabled` property set to `true`, the SDK will make
+use of cached values initially, and then make required API calls as usual and update the cache under the hood. Note that
+this is only the case for remote evaluation mode and does not affect the behaviour of local evaluation mode.
+
+The Cache will be used when retrieving environment or identity flags. When caching the environment flags, the SDK will
+use the unique environment key as the cache key. When caching the identity flags, the SDK will use a combination of the
+identifier and traits to build the cache key, this ensures that the flags are refetched from the API if an identity's
+traits change.
+
+The TTL for the cache is 5 minutes, and is not configurable.
+
 </TabItem>
 <TabItem value="nodejs" label="NodeJS">