added the contribution-guide for the project

Contribution-guide.md

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+Welcome contributors, this is the official site of the Training-Placement-Cell.
+Below is the setup-guide for this project.
+
+
+## Backend-setup
+
+1. Navigate to : *backend/config/database.js*
+		and apply these changes
+
+2. Navigate to : *backend/config/server.js*
+		and apply these changes
+
+3. To run backend:
+	```
+	cd backend
+	docker compose up -d
+	npm run dev || bun dev
+	```
+
+## Frontend-setup
+
+1. Navigate to: *frontend/config/index.js*
+		and apply these changes
+
+2. To run frontend:
+   ```
+   cd frontend
+   npm run dev || bun dev
+   ```
+
+## Strapi-setup
+
+1. Firstly, you have to signup to the strapi,
+
+2. Navigate to: *Settings/Roles*: it should look like this,
+
+3. Now for [roles and permissions configuration](https://docs.google.com/document/d/1D64h39SjRC3-Fcw2RU-U49l82BDDOIVuUudIiUJ9YNk/edit?usp=sharing):
+
+4. Content Manager: 
+	photo:
+
+5. Create some users of different profile (like coordinator, student etc.)  under "user" relation.
+
+
+## "document" is not defined (Error)
+
+- This error may come to you for after running the frontend this is basically due to SSR.
+- To handle this you should apply the dynamic imports in files containing "Lottie" (About.js , Loading.js and WhyUs.js) under *frontend/components/LandingPageElements*
+
+```
+import dynamic from "next/dynamic";
+
+const Lottie = dynamic(()=>import("lottie-react"),{ssr:false})
+```
+
+- **Never commit these changes this is only to remove the development error, it is not an error at the production**
+- ****
+
+## Do's and Don'ts
+- Always remove the console.logs which you have created while developing any feature or fixing bugs.
+- Make sure you don't expose or hardcode the Backend URL in any of your function.
+- Never commit the setup works which you have done inorder to run the project locally.
+- Make a new branch for every new bug fixing or feature.
+- Your local master || main branch should always be updated with the remote's main branch
+- Never make a pull request in the master branch, use test branch for it.
+- Pull request must have a detailed description about its intent you can find a template at **pull_request_template.md**.
+- The commits' messages and pull requests titles must be clear about the purpose they serve.
+- Watch the official repository so you will be informed about every actions there.
+