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">