Fix typo and formatting in README.md (#59)

Signed-off-by: Arthit Suriyawongkul <[email protected]>

Author: bact

AUTHORS

@@ -1,4 +1,3 @@
 Copyright (C) 2019 The Software Heritage developers
 
 See http://www.softwareheritage.org/ for more information.
-

README.md

@@ -6,7 +6,7 @@ CodeMeta documents (aka. `codemeta.json`).
 The [CodeMeta initiative](https://github.com/codemeta/codemeta) is a Free and Open Source academic collaboration
 creating a minimal metadata schema for research software and code.
 
-The academic community recommands on adding a codemeta.json file in
+The academic community recommends on adding a codemeta.json file in
 the root directory of your repository.
 
 With this linked data metadata file, you can easily declare the authorship,
@@ -16,7 +16,7 @@ data, etc.).
 Also, the `codemeta.json` file in your source code is indexed in the
 Software Heritage (SWH) archive, which will improve findability in searches.
 
-### References
+## References
 
 - [SWH guidelines](https://www.softwareheritage.org/save-and-reference-research-software/) for research software.
 
@@ -33,7 +33,7 @@ Software Heritage (SWH) archive, which will improve findability in searches.
 
 1. create a complete codemeta.json file from scratch
 2. aggregate existing information and add complementary information to
-a codemeta.json file
+   a codemeta.json file
 
 ### Functionalities
 
@@ -49,7 +49,7 @@ This tool was initially prepared for the [FORCE19 Hackathon](https://github.com/
 
 **NB:** codemeta v2.0 is generated by default, but v3.0 (v2.0 compatible) can be generated via a dedicated button.
 
-## Code contributions.
+## Code contributions
 
 This section only applies to developers who want to contribute to the Codemeta Generator.
 If you only want to use it, you can use
@@ -71,7 +71,7 @@ files (nginx, apache2, etc.).
 
 The simplest way is probably to use Python's HTTP server:
 
-```
+```shell
 git clone https://github.com/codemeta/codemeta-generator
 cd codemeta-generator
 python3 -m http.server
@@ -86,18 +86,17 @@ quickly, using [Cypress](https://www.cypress.io/).
 
 To run them, first install Cypress:
 
-```
+```shell
 sudo apt install npm  # or the equivalent on your system
 npx [email protected] install
 ```
 
 Then, run the tests:
 
-```
+```shell
 npx [email protected] run
 ```
 
-
 ## Contributed by
 
 ![Image description](https://annex.softwareheritage.org/public/logo/software-heritage-logo-title-motto.svg)