add how-to guide for using snap-review #6

snapcraft/how-to/how-to-use-snap-review.md

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+# How to use the snap review-tools to verify your snap
+
+`review-tools` is a tool that checks whether a snap meets the requirements for the Snap Store. Once you have created a snap it is highly recommended to use `review-tools` to verify it before submitting it to the Store. 
+
+This guide shows how to use `review-tools`, and considers some of its commands.
+
+## Prerequisites
+
+This guide assumes:
+- Command line knowledge
+- A Linux system running Ubuntu
+- An already built snap
+
+## Enable snapd
+
+First check whether `snapd` is enabled on your system. If you are using Ubuntu 16.04 LTS (Xenial Xerus) or later you most likely have `snapd` installed. 
+
+In the terminal type:
+
+```bash
+snap version
+```
+
+If you have `snapd` you will get something that looks like:
+
+```no-highlight
+snap    2.63+22.04
+snapd   2.63+22.04
+series  16
+ubuntu  22.04
+kernel  6.5.0-41-generic
+```
+
+If you do not have _snap_ it can be installed in two ways:
+
+1. Search for _snapd_ on the Ubuntu Software Centre and install
+2. Using the command line:
+
+```bash
+sudo update
+sudo apt install snapd
+```
+
+Then either log out and back in again, or restart your system. 
+
+## Install review-tools
+
+Once you have ensured you have snap, you need to install  `review-tools`, which contains the necessary tools to review your snap. From the command line  run:
+
+```bash
+sudo snap install review-tools
+```
+
+## Using review-tools
+
+Let us suppose your snap is named `awesomeApp.snap` and is located in the home folder. 
+
+Type: 
+
+```
+review-tools.snap-review awesomeApp.snap 
+
+```
+
+If there are no problems with your snap, the command will return something like:
+
+```
+awesomeApp.snap: pass
+```
+
+If there are any issues, the output will list them. These issues can range from missing metadata to security concerns. 
+
+## Common Issues
+
+Based on the output you will need to address the reported issues. Below are some common problems and how to fix them. 
+
+### Missing Metadata
+
+If you see warnings about missing fields like `description` or `license`, you need to add these fields to your `snapcraft.yaml` file. 
+
+### Security Warnings
+
+Security warnings might indicate that your snap is using restricted interfaces without proper permissions.
+
+## Retest the Snap
+
+After making the necessary changes rebuild your snap and rerun the review tools to ensure all issues have been resolved. 
+
+```bash
+review-tools.snap-review awesomeApp.snap
+```
+
+If your snap passes you can then submit it to the Snap Store.
+
+## Conclusion
+
+Using `review-tools` is a key step in ensuring your snap package is secure, consistent, and ready for publication in the Snap Store. By following this guide, you can identify and fix common issues before submitting your snap, increasing the likelihood of a smooth approval process. How to use the snap review-tools to verify your snap.