Add articles to README.md

Include articles for clarity.

Author: Amanda Butler

README.md

@@ -29,11 +29,11 @@ The [release notes](https://os.mbed.com/releases) detail the current release. Yo
 
 ## License and contributions 
 
-The software is provided under [Apache-2.0 license](LICENSE-apache-2.0.txt). Contributions to this project are accepted under the same license. Please see [contributing.md](CONTRIBUTING.md) for more info.
+The software is provided under the [Apache-2.0 license](LICENSE-apache-2.0.txt). Contributions to this project are accepted under the same license. Please see [contributing.md](CONTRIBUTING.md) for more information.
 
 This project contains code from other projects. The original license text is included in those source files. They must comply with our [license guide](https://os.mbed.com/docs/latest/reference/license.html).
 
-Folders containing files under different permissive license than Apache 2.0 are listed in [LICENSE](LICENSE) file.
+Folders containing files under different permissive license than Apache 2.0 are listed in the [LICENSE](LICENSE) file.
 
 ## Getting started for developers