Add Awesome tech Newsletter

[Himish04]

Adds Awesome Tech Newsletters to the list under the Blogs, Newsletters, and Podcasts section.

Why this repository is valuable:

• Centralized Discovery: It provides a community-curated, centralized directory of top newsletters by and for software engineers, developer advocates, and technology founders.
• Developer Growth: Helps developers easily learn new technologies, B2B SaaS and developer marketing strategies.
• Actively Maintained: The list is structured cleanly to ensure high-quality, relevant newsletter discovery for the open-source community.

Type of change

• Add a new resource
• Update an existing resource
• Fix formatting/typos
• Improve categorization

Checklist

• I have read contributing.md.
• My change is specifically relevant to developer marketing.
• I used the format [Name](URL) - Description. for list entries.
• I checked for duplicate entries.
• Descriptions are concise, objective, and end with a period.
• I verified links are valid and not broken.
• I used canonical HTTPS URLs without shorteners or tracking parameters.
• I disclosed any affiliation with the added/updated resource.
• This pull request contains a single logical change.

Affiliation Disclosure

I am a contributor to this project.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}