chore: add release plan [skip ci]

RELEASE_PLAN.md

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+## Release Plan
+
+Starting with version `v2.4`, Nuxt will adhere to a formalized release plan (as good as possible).
+Also, an end of life for older major versions is defined with this document
+
+### Major versions (3.x -> 4.0)
+
+Nuxt major releases are planned every **6 months**. This depends on a few factors though:
+
+* If there are no breaking changes waiting for a release, no new major version will be published. Instead, another minor one will be released. 
+* In case of unexpected major updates of important dependencies like Vue, Webpack, and so on, major versions might be released *earlier* than planned.
+
+The goal is to provide a **migration guide** for each major version as well, as escape hatches, so existing code
+won't "just break".
+
+### Minor versions (2.1 -> 2.2)
+
+The release cycle for Nuxt.js minor versions is roughly **4 weeks**. 
+
+Three of the four weeks will be used for actual **feature implementations** while the last week will be used for 
+**testing, fixing bugs and thorough audits**.
+
+That also means a *feature freeze* for the next minor version after these three weeks.
+Features that aren't ready will be moved to the next cycle. "Waiting" for features 
+(for a longer time) will be avoided as good as possible to keep releases lean, concise, predictable and digestible.
+
+### Patch releases (2.2.3 -> 2.2.4)
+
+The last patch releases were mostly *bundled* fixes or single *hotfixes*. 
+In the future, fixes will be released **as soon as possible** after the actual PR/commit so people won't have to switch to `nuxt-edge` for bugfixes. This should improve the stability of Nuxt
+
+Fixes can or will include:
+
+* Updates of dependencies (for various reasons, like a "faulty/buggy" dependency or an newer versions that works better with the Nuxt.js code)
+* Fixes for our code
+
+Bugfixes for upcoming features won't be ported of course.
+
+### Edge Release Channel
+
+After experimenting with `nuxt-edge` releases in the last time, the decisiion to do **nightly releases** for now instead of 
+releasing a version after *each commit* was made.
+
+## End of Life
+
+Starting with `v2.4`, every major Nuxt.js version will have an **End of Life**.
+Previous releases will receive security updates and bugfixes **for one year and two weeks**, counted from the first release on. 
+As Nuxt majors are approximately released once every 6 months, this will allow developers to "skip one major version" without being stuck with a broken or unsecure Nuxt.js dependency.
+The EOL also applies to the documentation.