Adds "English language" section

README.md

@@ -6,6 +6,7 @@
 
 # Naming cheatsheet
 
+- [English language](#english-language)
 - [Naming convention](#naming-convention)
 - [S-I-D](#s-i-d)
 - [Avoid contractions](#avoid-contractions)
@@ -24,6 +25,22 @@ Naming things is hard. This sheet attempts to make it easier.
 
 Although these suggestions can be applied to any programming language, I will use JavaScript to illustrate them in practice.
 
+## English language
+
+Use English language when naming your variables and functions.
+
+```js
+/* Bad */
+const primerNombre = 'Gustavo'
+const amigos = ['Kate', 'John']
+
+/* Good */
+const firstName = 'Gustavo'
+const friends = ['Kate', 'John']
+```
+
+> Like it or not, English is the dominant language in programming: the syntax of all programming languages is written in English, as well as countless documentations and educational materials. By writing your code in English you dramatically increase its cohesiveness.
+
 ## Naming convention
 
 Pick **one** naming convention and follow it. It may be `camelCase`, or `snake_case`, or anyhow else, it does not matter. What matters is for it to remain consistent.