docs: Updated Readme.md

1️⃣ Need to provide a clear and easy to follow, steps for installing and using the extension/add-on. ✔️ 
2️⃣ Warn about the auto-update downside in manual install. ✔️ 
3️⃣ Add relevant screenshots for ease of understanding. ✔️

Author: code-reaper08

README.md

@@ -8,9 +8,96 @@ _Strip the CSS!_
 
 <div align="center">
 
-### OnlyHTML is an Open-Source Chrome extension to view, only the HTML of the webpage.
-
-**_Note :_** This is not yet released on the **chrome web store.**
-  
+### OnlyHTML is an Open-Source browser extension to view, only the HTML of the webpage.
 </div>
 
+## What it does?
+Most of the websites nowadays have a overwhelming amount of **CSS** in them, which makes them so pretty and user friendly. This motivated me to know, how would these websites look without **CSS**.
+
+This gave birth to **OnlyHTML**, which removes all the CSS from the current viewing webpage.
+
+## Usecases I think of
+There are two aspects, which I think one can gain/know using this add-on.
+1. **Importance of CSS**, and how it drastically improves the UI.
+2. **FUN!** seriously it is quite fun to see websites without CSS.
+
+## Available for
+**OnlyHTML** browser extension is developed for both Chrome and Firefox, although Chrome version is not yet avaliable in the [chrome web store](https://chrome.google.com/webstore/category/extensions)
+
+Firefox add-on is successfully verified and available on the official [Firefox add-on page](https://addons.mozilla.org/en-US/firefox/)
+
+## Steps for using the extension
+**For Chrome:**
+
+Not available as of now.
+
+**For Firefox:**
+
+There are two ways for you to use the Firefox add-on,
+1. Adding to your browser from [onlyhtml- Firefox add-on official site](https://addons.mozilla.org/en-US/firefox/addon/onlyhtml/).
+2. Manually installing using the **.xpi** file available in this repository.
+
+### **Installing from the official Firefox add-on website**
+1. Head over [here](https://addons.mozilla.org/en-US/firefox/addon/onlyhtml/) using Firefox.
+2. Click on **Add to Firefox** Button.
+
+![Step2](https://user-images.githubusercontent.com/64256342/147415243-cea9044d-a44c-4746-9a4c-a30fd16fe6c3.png)
+
+3. Now the add-on is successfully added to your browser.
+
+![step3](https://user-images.githubusercontent.com/64256342/147415298-5e57d1c8-4f2f-46cc-9ebb-f705771df4d0.png)
+
+4. To use the add-on click on the icon shown in **step 3**, when viweing a webpage.
+5. **Voila! All CSS removed.**
+6. To have the CSS back, click on the same icon again.
+7. Alright have some **FUN!**
+
+### **Installing using the .xpi file**
+To install the add-on using the .xpi file, follow the below steps.
+1. In this repository navigate to `Firfox/onlyhtml-1.0-fx.xpi` or [click here](https://github.com/code-reaper08/OnlyHTML/blob/main/Firefox/onlyhtml-1.0-fx.xpi).
+2. Click on the **Download** button.
+
+![image](https://user-images.githubusercontent.com/64256342/147415422-884c22d1-f20c-41d2-8dc2-798070008768.png)
+
+3. Open **Add-ons and Themes menu** or press `Ctrl+Shift+A`
+
+![menu](https://user-images.githubusercontent.com/64256342/147415497-68a7d296-ea69-4421-a518-b5c1712137ec.png)
+
+4. Click on gear icon and **Install Add-on from file...** option inside the menu.
+
+![from file](https://user-images.githubusercontent.com/64256342/147415528-9bbe3bcb-a08f-41ee-b4aa-1578f93edd51.png)
+
+5. Select the **.xpi** file, downloaded in **Step 2**
+6. Click on **Add** and **Okay** in the subsequent prompts.
+7. Now you can use the add-on normally.
+
+_**Note:**_ The only downside for this approach is, the add-on is not auto-updatable.
+
+## Found some bugs?
+File them in the [issues section](https://github.com/code-reaper08/OnlyHTML/issues). I'll fix them as soon as possible.
+Make sure to try it out, It may have some bugs, Hopefully I will be keeping an eye and continuously update it in the future.
+
+## Licnese:
+```
+MIT License
+
+Copyright (c) 2021 Vishwa.R
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+```