docs(oneMatch): Adding the subject of exercice oneMatch for js piscine

subjects/oneMatch/README.md

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+## oneMatch
+
+### Instructions
+
+Create a function named oneMatch , that takes two arguments: the first is a string, and the second  is a regular expressions.
+
+Your function should return a boolean , true if the regular expression match the string and false if it dosen't.
+
+### Expected function
+
+```js
+function oneMatch(inputString, regex){
+
+}
+```
+
+### Usage
+
+Here is a possible program to test your function :
+
+```js
+const rgx1 = /\d{3}-\d{2}-\d{4}/;
+const str1 = "123-45-6789";
+console.log(oneMatch(str1, rgx1));
+const rgx2 = /^[A-Za-z\s]+$/;
+const str2 = "Hello World";
+console.log(oneMatch(str2, rgx2)); 
+const rgx3 = /^[\d]+$/; 
+const str3 = "abc123";
+console.log(oneMatch(str3, rgx3));
+const rgx4 = /[^0-9]/;
+console.log(oneMatch(str4, rgx4));
+```
+
+And its output :
+
+```console
+$ node index.js
+true
+true
+false
+false
+$
+```