Feat: add how-to-buy-alex-tokens guide

docs/getting-started/how-to-buy-alex-tokens.md

@@ -0,0 +1,18 @@
+---
+description: Follow these steps to buy ALEX tokens 
+---
+
+# 🪙 How to Buy ALEX tokens
+
+Starting from the [AlexLab](https://alexlab.co/) website, if you click on the “Buy ALEX” button, it will display all the available markets where the ALEX token can be purchased.
+
+<figure><img src="../.gitbook/assets/buy-alex-how-to/select-market.png" alt=""><figcaption></figcaption></figure>
+
+The procedure will be different depending on the marketplace you choose to buy ALEX tokens. However, if you decide to use the [Alex Lab](https://app.alexlab.co/swap) platform (the last option on the list), you can follow these detailed guides, which use the ALEX token as an example of how to perform a swap:
+
+1. First, connect your wallet. You can follow this step-by-step guide:
+https://docs.alexlab.co/getting-started/how-to-connect-your-wallet
+
+2. Next, depending on which token you want to trade for ALEX tokens, you can follow one of these guides:
+    - [Bitcoin Swap](https://docs.alexlab.co/what-can-you-do/bitcoin-swaps/how-to) to exchange tokens using the Bitcoin Native Swap
+    - [Stacks Swap](https://docs.alexlab.co/what-can-you-do/stacks-swaps/how-to) to exchange tokens in the Stacks Bitcoin L2