general: readme; rename build.sh; clean.sh script

Fix readme

build.sh

@@ -1,49 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-export ALLOW_NINJA_ENV=true
-export USE_CCACHE=1
-export LD_LIBRARY_PATH=/usr/lib:/usr/lib32
-export LC_ALL=C
-export LANG=C
-export LC_CTYPE=C
-
-# export LOCAL_CFLAGS=-Wno-error
-
-BUILD_DIR="./build"
-PATCH_DIR="./patches"
-MANIFEST_URL="https://github.com/minimal-manifest-twrp/platform_manifest_twrp_omni.git"
-MANIFEST_BRANCH="twrp-5.1"
-DEVICE_TREE_URL="https://git.cfpi-fpsi.eu:8443/rubenslte/twrp_device_samsung_rubenslte"
-KERNEL_URL="https://git.cfpi-fpsi.eu:8443/rubenslte/android_kernel_samsung_rubenslte"
-
-if [ ! -d "${BUILD_DIR}/.repo" ]; then
-    echo "Creating build directory ${BUILD_DIR} and cloning manifest ${MANIFEST_URL} from branch ${MANIFEST_BRANCH}..."
-    mkdir -p "${BUILD_DIR}"
-    cd "${BUILD_DIR}"
-    repo init --depth 1 -u "${MANIFEST_URL}" -b "${MANIFEST_BRANCH}"
-fi
-
-if [ ! -d "${BUILD_DIR}/device/samsung/rubenslte" ]; then
-    echo "Cloning device tree..."
-    git clone "${DEVICE_TREE_URL}" "${BUILD_DIR}/device/samsung/rubenslte"
-fi
-
-if [ ! -d "${BUILD_DIR}/kernel/samsung/rubenslte" ]; then
-    echo "Cloning kernel source..."
-    git clone "${KERNEL_URL}" "${BUILD_DIR}/kernel/samsung/rubenslte"
-fi
-
-for patch in "${PATCH_DIR}/*.patch"; do
-    echo "Applying $(basename "$patch")"
-    (cd "${BUILD_DIR}" && patch -p1 -N -r- < "$patch" 2>/dev/null || true)
-fi
-
-cd "${BUILD_DIR}"
-set +u
-source build/envsetup.sh
-lunch "omni_rubenslte-userdebug"
-set -u
-mka recoveryimage
-
-echo "Build results in ${BUILD_DIR}/out/target/product/rubenslte"