Revise caution note about library usage (#52)

Updated caution note in README regarding library usage.

Author: ed-george

README.md

@@ -22,7 +22,8 @@ This library forks both the `androidx.security:security-crypto` and the `android
 
 ### Should I be using this library?
 
-**TL;DR - No, probably not.**
+> [!CAUTION]
+> **TL;DR - No, probably not.**
 
 The existance of `EncryptedSharedPreferences` has misled many developers by implying that there's an inherent insecurity with `SharedPreferences`, which is simply not true.
 
@@ -124,4 +125,4 @@ distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
-```
+```