Update README.md and meta-agl.md

Remove duplication and update to dunfell.

Signed-off-by: Jan-Simon Möller <jsmoeller@linuxfoundation.org>
Change-Id: I2a34a926e06b6b9b8ba49f57533f1df46b39e8ce
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/25043
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-boot-test: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>

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-# 'meta-agl' layer
-
-See README-AGL.md for general information about Automotive Grade Linux.
-
-## meta-agl, the core layer for Automotive Grade Linux Distribution
-
-AGL is creating an automotive specific Linux distribution that unifies
-the software that has been written in a number of places already,
-such as GENIVI and Tizen IVI.
-
-The layer 'meta-agl' provides a minimal set of software
-to boot system of AGL Distribution. 'meta-agl' is the minimal
-core which is used build AGL profiles on top of it.
-
-Especially there is no reference UI included which is part of 'meta-agl-demo'.
-
-Additional components like the security framework are part of 'meta-agl-extra'.
-
-The AGL community appreciates feedback, ideas, suggestion, bugs and
-documentation just as much as code. Please join the irc conversation
-at the #automotive channel on irc.freenode.net and our mailing list.
-
-For infomation for subscribing to the mailing list
-    [agl-dev-community](https://lists.automotivelinux.org/g/agl-dev-community)
-For information about AGL Distribution, see the
-    [AGL Distribution](https://wiki.automotivelinux.org/agl-distro)
-For information abount Getting started with AGL
-    [here](https://wiki.automotivelinux.org/start/getting-started)
-For information about contributing to the AGL Distro
-    [here](https://wiki.automotivelinux.org/agl-distro/contributing)
-
-## Quick start guide
-
-See README-AGL.md
-
-## 'meta-agl' Layer Dependencies
-
-* poky
-  > URI: git://git.yoctoproject.org/poky
-  > branch         : jethro
-  > tested revision: 40376446904ae3529be41737fed9a0b650ed167d
-
-* meta-openembedded
-  > URI: git://git.openembedded.org/meta-openembedded
-  > layer          : meta-openembedded
-  > branch         : jethro
-  > tested revision: 8ab04afbffb4bc5184cfe0655049de6f44269990
-
-Specifically out of meta-openembedded these sub-layers are used:
-
-* meta-openembedded/meta-oe
-* meta-openembedded/meta-multimedia
-* meta-openembedded/meta-networking
-* meta-openembedded/meta-python
-
-## Layers
-
-There are 5 layers in top-level `meta-agl`.
-
-* `meta-agl/meta-ivi-common`\
-  `meta-ivi-common` is a layer which contains common packages to AGL
-  Distribution and other platforms for In-Vehicle Infotainment system.
-* `meta-agl/meta-agl`\
-  `meta-agl` is a layer which contains AGL common and middleware packages.
-* `meta-agl/meta-agl-bsp`\
-  `meta-agl-bsp` is a layer which contains required packages to boot AGL
-  distribution on an emulated machine(QEMU).
-* `meta-agl/meta-netboot`\
-  `meta-netboot` contains the netboot initrd support recipes. This is needed
-  in case of booting over the network as NFS does not support the securitylabels.
-
-## Packagegroups
-
-AGL package group design:
-
-* packagegroup-agl-image-minimal
-
-        packagegroup-agl-core-automotive.bb
-        packagegroup-agl-core-connectivity.bb
-        packagegroup-agl-core-graphics.bb
-        packagegroup-agl-core-kernel.bb
-        packagegroup-agl-core-multimedia.bb
-        packagegroup-agl-core-navi-lbs.bb
-        packagegroup-agl-core-os-commonlibs.bb
-        packagegroup-agl-core-security.bb
-        packagegroup-agl-core-speech-services.bb
-
-These are for making image ``agl-image-minimal`` which is small image just
-capable of allowing a device to boot.
-
-Subsystem should maintain packagegroup-agl-core-[subsystem].bb which should
-hold sufficient packages to build ``agl-image-minimal``.
-
-* packagegroup-agl-image-ivi
-
-        packagegroup-agl-ivi-automotive.bb
-        packagegroup-agl-ivi-connectivity.bb
-        packagegroup-agl-ivi-graphics.bb
-        packagegroup-agl-ivi-kernel.bb
-        packagegroup-agl-ivi-multimedia.bb
-        packagegroup-agl-ivi-navi-lbs.bb
-        packagegroup-agl-ivi-os-commonlibs.bb
-        packagegroup-agl-ivi-security.bb
-        packagegroup-agl-ivi-speech-services.bb
-
-These are for making image ``agl-image-ivi`` which is baseline for the profiles
-of AGL distro. 'Baseline' means Service Layer and Operating System Layer defined
-in AGL Spec v1.0.
-
-* packagegroup-agl-test.bb
-
-Additional tools used in QA tests (for agl-image*-qa).
-
-* packagegroup-ivi-common*
-
-        packagegroup-ivi-common-core-automotive.bb
-        packagegroup-ivi-common-core.bb
-        packagegroup-ivi-common-core-connectivity.bb
-        packagegroup-ivi-common-core-graphics.bb
-        packagegroup-ivi-common-core-kernel.bb
-        packagegroup-ivi-common-core-multimedia.bb
-        packagegroup-ivi-common-core-navi-lbs.bb
-        packagegroup-ivi-common-core-os-commonlibs.bb
-        packagegroup-ivi-common-core-security.bb
-        packagegroup-ivi-common-core-speech-services.bb
-        packagegroup-ivi-common-test.bb
-
-These are for picking up some packages from upstreams like GENIVI/Tizen/Others.
-The layer of ``meta-ivi-common`` has no image to build, all packagegroups are
-aggregated to ``packagegroup-ivi-common-core' and it is included by images,
-``agl-image-ivi.bb`` and ``agl-demo-platform.bb``.
-
-## Supported Machines
-
-See [docs.automotivelinux.org](http://docs.automotivelinux.org)

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