Improve README.md (#2)

* Update README.md
* Embedding code into Markdown

README.md

@@ -1,5 +1,8 @@
 # Readme code testing example
 
+![Test code and embed into README](https://github.com/tokusumi/readme-code-testing/workflows/Test%20code%20and%20embed%20into%20README/badge.svg)
+
+
 This repo demonstrates [Markdown Embed Code From File](https://github.com/marketplace/actions/markdown-embed-code-from-file) (GitHub Action).
 
 
@@ -11,7 +14,7 @@ You could put code in external file and test them, as same as ordinary testing y
 
 ## Mark your code for embedding
 
-This action could inspect your code, if you add a file path in code block as "`lang:external/file/path.py`".
+This action could inspect your code, if you add a file path in code block as "\`\`\`lang:external/file/path.py\`\`\`".
 
 
 The following code block has a file path `src/helloworld.py`:
@@ -22,18 +25,19 @@ def hello():
     return "world"
 ```
 
-See in [src/helloworld.py]() as:
+See with [src/helloworld.py]() as:
 
 
-* The code is synchronized.
-* The code is highlighting in readme
+* Synchronized code.
+* Highlighting code in readme.
+* Not affected code rendering.
 
-And notice that nothing to do re-embedding new/modified code.
+And notice that nothing to do re-embedding new/modified code. This action overrides code if you change code in external file.
 
 
 ### Multiple use
 
-You might add one file path (ex. [src/mul.py]())for multiple code blocks:
+You might add one file path (ex. [src/mul.py]()) for multiple code blocks:
 
 
 ```py:src/mul.py
@@ -66,7 +70,7 @@ Notice that this action goes to "fail" if a file you add does not exist.
 This action could work for any programming "language".
 
 
-Ideally you could write as "`lang:external/file/path.py`", but actually this action does not inspect "lang", just read path and copy&paste strings into target code block in markdown.
+Ideally you could write as "\`\`\`lang:external/file/path.py\`\`\`", but actually this action does not inspect "lang", just read path and copy&paste strings into target code block in markdown.
 
 
 So, missing "lang" is available: