Chore(DPxAI): add solution for play with variables

subjects/DPxAI/play-with-variables/README.md

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+## Play with variables
+
+### Context
+
+If things get a little hectic at times, take the time to get closer to your peers so that you can think, share and move forward together.
+
+> Keep Going!
+
+### AI-Powered Learning Techniques
+
+**Clarification Technique:**
+
+This type of prompt encourages the AI to explain a concept in detail, helping you gain a deeper understanding.
+
+> Find the examples across the subject ;)
+
+## Concepts
+
+### Escape characters
+
+**Quote delimiters** can be one of the tricky things to deal with.
+
+Since they are used for delimiting text, they need a trick to include them in
+our text.
+
+For example, we want a `'` _(single quote)_ in our text, but use them as
+delimiters:
+
+```js
+console.log('I keep trying , I can't give up! ')
+// too bad a single quote, ruined the quote, get it ? XD
+```
+
+The `\` _(backslash)_ is used for that:
+
+Every time there is an _extra special_ character into your string, putting a `\`
+in front of it will **escape** it and doing so will let JS understand you meant
+the **literal** following character and not the delimiter, _or whatever else
+the character normaly means for a string_
+
+```js
+console.log("I keep trying , I can't give up! ");
+
+// Output: I keep trying, I can't give up!
+```
+
+#### `Prompt Example`:
+
+"As a beginner, how do I include special characters in a string in JavaScript? Give me simple examples too."
+
+### Assign re-assign
+
+Remember the let keyword used to declare new variables.
+
+> Note that we can't have multiple variables with the same identifier otherwise JS wouldn't know which one is which.
+
+Redeclaring a variable will crash !
+
+But it is still possible to use the = (assignment operator) to change its value !
+
+> Note that sometimes you may find variable declared with const. This means that the assignation is constant and can never be re-assigned !
+
+> It is used to protect your code against errors, but you can always use `let` in its place..
+
+> Also you may find online old code using var. We are trying to get rid of var's since 2015. It's ancient syntax and it was pretty problematic. Never use it! If you see code using it, try to find a more recent example. That one is outdated.
+
+#### `Prompt Example`:
+
+- "As a beginner, what is the difference between let and const in JavaScript?"
+- "As a beginner, how do I reassign a value to an already declared variable in JavaScript?"
+
+### Instructions
+
+#### Task 1:
+
+- Create a `escapeFromDelimiters` variable that includes all 3 quotes _(`` ` ``, `"` and
+  `'`)_.
+
+- Create a `escapeTheEscape` variable that includes a backslash _(`\`)_.
+
+#### Task 2:
+
+- The variable `power` has been declared and will be used during the tests.
+
+- You must try to re-assign the love variable to the string value `levelMax` !! but without re-declaring it !
+
+---
+
+> “How did I escape? With difficulty. How did I plan this moment? With
+> pleasure.” \
+> ― Alexandre Dumas, The Count of Monte Cristo