Add license agreement for software usage and reuse

Added a comprehensive license agreement outlining usage, ownership, and reuse conditions for the software.

LICENSE

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+1. Scope
+
+The copyright holders offering software, source code, assets, or other content
+under these terms ("we") grant the permissions below to every individual, team,
+company, organization, and other entity ("you"). "Work" means the software,
+source code, assets, and other content we offer under these terms.
+
+2. Using the product and owning your output
+
+You may use the customer-facing software or product for any purpose, including
+commercial purposes, without payment, acknowledgment, or a copy of these terms.
+This includes installing, running, accessing, and self-hosting it, and compiling
+it solely to run it.
+
+Whatever you create through ordinary use of the product is yours. We claim no
+ownership of your output and impose no payment, acknowledgment, or licensing
+conditions on it. You may use, sell, share, or license it however you choose.
+Merely copying or extracting the underlying codebase or assetbase is reuse
+under section 3.
+
+3. Reusing code or assets
+
+Subject to section 4, you have worldwide, nonexclusive permission to copy,
+modify, combine, publish, distribute, sublicense, sell, and otherwise reuse any
+or all of the Work, for any purpose, in source or other forms.
+
+4. Finding common ground
+
+If you reuse the codebase or assetbase, you are responsible for satisfying one
+of the following conditions when you begin that reuse:
+
+- If you cannot reasonably afford a monetary payment, give a simple
+  acknowledgment of the original software or repository in an appropriate
+  place, such as your README, source code, website, or documentation. A name
+  mention or a link is enough. No particular wording or placement is required.
+
+- If you can afford a monetary payment, sponsor the original
+  repository through its Sponsor button. You alone decide the minimum
+  reasonable amount you can afford, considering the circumstances of the entity
+  reusing the Work. Sponsorship may be one-time or monthly. If you pay any
+  positive amount, acknowledgment and links are optional.
+
+An entity may satisfy this condition through someone acting on its behalf.
+
+5. Final settlement
+
+Any positive amount successfully paid through that sponsorship route fully
+and permanently satisfies the reuse condition for the entity making it or on
+whose behalf it is made. Your chosen amount is accepted as sufficient,
+regardless of your financial means.
+We will not challenge its adequacy, request financial evidence, or demand a
+larger amount. A record of the completed payment is sufficient proof; no
+separate approval or agreement is needed.
+
+The first completed monthly payment is enough. Later payments are optional,
+and you may cancel recurring sponsorship without losing your permissions.
+
+Likewise, an appropriate acknowledgment fully satisfies the condition for an
+entity using the acknowledgment option.
+
+Once satisfied, the condition covers all reuse by that entity of the Work
+offered under these terms in the same original repository, including later
+versions. No payment or acknowledgment is required again for additional uses,
+copies, releases, or products. The permissions granted are then irrevocable
+for that Work.
+
+6. Choosing another license
+
+After satisfying section 4, you may distribute or sublicense the Work,
+modified or unmodified, under any license you choose. You do not have to include
+these terms, keep this license, or require anyone else to follow it. These
+terms require no retained copyright or license notices; the acknowledgment
+option in section 4 is the only acknowledgment requirement.
+
+Recipients of the Work you distribute under another license follow that
+license and owe us no payment or acknowledgment under these terms for that
+Work. Relicensing grants permissions; it does not transfer ownership of
+the original Work.
+
+7. Warranty
+
+To the extent permitted by law, the Work is provided "as is," without any
+warranty, including merchantability, fitness for a particular purpose, or
+noninfringement. We are not liable for any claim, loss, or damages arising from
+the Work or its use.