update README.md

test_image.py

-from configs.model_config import *
-import nltk
-
-nltk.data.path = [NLTK_DATA_PATH] + nltk.data.path
-
-filepath = "./img/test.jpg"
-from loader import UnstructuredPaddleImageLoader
-
-loader = UnstructuredPaddleImageLoader(filepath, mode="elements")
-docs = loader.load()
-for doc in docs:
-    print(doc)

test_pdf.py

-from configs.model_config import *
-import nltk
-
-nltk.data.path = [NLTK_DATA_PATH] + nltk.data.path
-
-filepath = "docs/test.pdf"
-from loader import UnstructuredPaddlePDFLoader
-
-loader = UnstructuredPaddlePDFLoader(filepath, mode="elements")
-docs = loader.load()
-for doc in docs:
-    print(doc)