Rename TSInjex to TSinjex and Add Jest Setup in README

Renamed all instances of 'TSInjex' to 'TSinjex' for consistency across the codebase, including interfaces, classes, and test files. Updated the version in `package.json` from 0.0.5 to 0.0.6. Added Jest setup example to the `README.md` to guide developers on initial configuration for testing.

src/decorators/RegisterInstance.ts

@@ -1,4 +1,4 @@
-import { TSInjex } from '../TSInjex';
+import { TSinjex } from '../TSinjex';
 import { InitDelegate } from '../types/InitDelegate';
 
 /**
@@ -28,7 +28,7 @@ export function RegisterInstance<
 ) {
     return function (constructor: TargetType, ...args: unknown[]): void {
         // Get the instance of the DI container
-        const diContainer = TSInjex.getInstance();
+        const diContainer = TSinjex.getInstance();
 
         // Create a proxy to instantiate the class when needed (Lazy Initialization)
         let lazyProxy: unknown = new Proxy(