👷 Updating contribution guidelines

[mormubis]

Motivation

At the beginning, it could be quite challenging to understand how to use the SDK in development.

Changes

This PR adds a section in the CONTRIBUTING.md file to help developers get started with the SDK,
including instructions on how to run the project and install the browser extension.

Test instructions

N/A

Checklist

• Tested locally
• Tested on staging
• Added unit tests for this change.
• Added e2e/integration tests for this change.

[cit-pr-commenter]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	146.83 KiB	146.83 KiB	0 B	0.00%	✅
Rum Recorder	18.02 KiB	18.02 KiB	0 B	0.00%	✅
Rum Profiler	4.63 KiB	4.63 KiB	0 B	0.00%	✅
Logs	51.70 KiB	51.70 KiB	0 B	0.00%	✅
Flagging	0 B	935 B	935 B	N/A%	✅
Rum Slim	106.45 KiB	106.45 KiB	0 B	0.00%	✅
Worker	23.59 KiB	23.59 KiB	0 B	0.00%	✅

🚀 CPU Performance

Action Name	Base Average Cpu Time (ms)	Local Average Cpu Time (ms)	𝚫
addglobalcontext	0.015	0.008	-0.006
addaction	0.039	0.040	0.000
addtiming	0.010	0.008	-0.002
adderror	0.038	0.035	-0.003
startstopsessionreplayrecording	0.002	0.001	-0.000
startview	0.010	0.006	-0.004
logmessage	0.047	0.040	-0.007

🧠 Memory Performance

Action Name	Base Consumption Memory (bytes)	Local Consumption Memory (bytes)	𝚫 (bytes)
addglobalcontext	26.61 KiB	28.22 KiB	1.62 KiB
addaction	51.16 KiB	57.17 KiB	6.01 KiB
addtiming	26.09 KiB	27.12 KiB	1.04 KiB
adderror	58.89 KiB	60.33 KiB	1.43 KiB
startstopsessionreplayrecording	23.99 KiB	25.42 KiB	1.42 KiB
startview	428.01 KiB	431.94 KiB	3.94 KiB
logmessage	57.78 KiB	63.66 KiB	5.88 KiB

🔗 RealWorld

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.36%. Comparing base (e5f565e) to head (3f13e93).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3607      +/-   ##
==========================================
- Coverage   92.37%   92.36%   -0.02%     
==========================================
  Files         323      323              
  Lines        8132     8132              
  Branches     1842     1842              
==========================================
- Hits         7512     7511       -1     
- Misses        620      621       +1     

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