updating the README.md

Author: karen-avetisyan-mc

README.md

@@ -152,21 +152,42 @@ var config = JweConfigBuilder.AJweEncryptionConfig()
 
 ###### Supported Encryption Algorithms
 
-The library supports the following JWE encryption algorithms:
+The library supports the following JWE encryption algorithms according to [RFC 7516](https://datatracker.ietf.org/doc/html/rfc7516):
 
-**AES-GCM (Galois/Counter Mode):**
+**Key Encryption Algorithms (`alg` header):**
 
-- `A128GCM` - AES-128 with GCM mode
-- `A192GCM` - AES-192 with GCM mode
-- `A256GCM` - AES-256 with GCM mode (default)
+| Algorithm | Description | Key Size |
+|-----------|-------------|----------|
+| `RSA-OAEP` | RSAES using Optimal Asymmetric Encryption Padding (OAEP) with SHA-1 and MGF1 | 2048+ bits |
+| `RSA-OAEP-256` | RSAES-OAEP using SHA-256 and MGF1 with SHA-256 | 2048+ bits |
 
-**AES-CBC with HMAC (Cipher Block Chaining with HMAC authentication):**
+**Content Encryption Algorithms (`enc` header):**
 
-- `A128CBC-HS256` - AES-128-CBC with HMAC-SHA256
-- `A192CBC-HS384` - AES-192-CBC with HMAC-SHA384
-- `A256CBC-HS512` - AES-256-CBC with HMAC-SHA512
+| Algorithm | Description | Key Size | Authentication |
+|-----------|-------------|----------|----------------|
+| `A128GCM` | AES-128 with Galois/Counter Mode | 128 bits | Built-in |
+| `A192GCM` | AES-192 with Galois/Counter Mode | 192 bits | Built-in |
+| `A256GCM` | AES-256 with Galois/Counter Mode (default) | 256 bits | Built-in |
+| `A128CBC-HS256` | AES-128-CBC with HMAC-SHA256 | 256 bits (128+128) | HMAC-SHA256 |
+| `A192CBC-HS384` | AES-192-CBC with HMAC-SHA384 | 384 bits (192+192) | HMAC-SHA384 |
+| `A256CBC-HS512` | AES-256-CBC with HMAC-SHA512 | 512 bits (256+256) | HMAC-SHA512 |
 
-The encryption algorithm is determined by the `enc` header parameter in the JWE header.
+**Algorithm Selection:**
+
+The encryption algorithm is determined by the `enc` parameter in the JWE header. For example:
+
+```json
+{
+  "alg": "RSA-OAEP-256",
+  "enc": "A256GCM",
+  "kid": "761b003c1eade3a5490e5000d37887baa5e6ec0e226c07706e599451fc032a79"
+}
+```
+
+**GCM vs CBC-HMAC:**
+
+- **AES-GCM (Recommended):** Provides both encryption and authentication in a single operation. Default choice for new implementations.
+- **AES-CBC-HMAC:** Provides encryption via CBC mode and authentication via HMAC. Requires two separate operations and proper HMAC verification configuration.
 
 ###### Configuring CBC-HMAC Verification