add md, and fix manager init

Author: Eikykun

docs/img/img4.png

@@ -0,0 +1,16 @@
+
+
+# Kridge
+
+Kridge is a solution that helps developers manage their controllers/operators better.
+
+The design architecture of this project is based on [openkruise/controllermesh](https://github.com/openkruise/controllermesh).
+
+## Key Features
+
+1. **Sharding**: Through relevant configurations, Kubernetes single-point deployed operator applications can be flexibly shard deployed.
+2. **Canary upgrade**: Depends on sharding, the controllers can be updated in canary progress instead of one time replace.
+3. **Circuit breaker and rate limiter**: Not only Kubernetes operation requests, but also other external operation requests.
+4. **Multicluster routing and sharding**: This feature is supported by [kusionstack/kaera(karbour)]()
+
+<p align="center"><img width="800" src="../docs/img/img4.png"/></p>

docs/installation.md

@@ -28,7 +28,9 @@ var (
 
 func WarpNewCacheWithSelector(selector *cache.ObjectSelector, selectorsByObj cache.SelectorsByObject) func(config *rest.Config, opts cache.Options) (cache.Cache, error) {
 	return func(config *rest.Config, opts cache.Options) (cache.Cache, error) {
-		opts.DefaultSelector = *selector
+		if selector != nil {
+			opts.DefaultSelector = *selector
+		}
 		opts.SelectorsByObject = selectorsByObj
 		return cache.New(config, opts)
 	}