Add readme file for composer package deploy flow

ReadMe.composer-release.md

@@ -0,0 +1,21 @@
+# CoreLibs Composer release flow
+
+- run local phan/phptan/phunit tests
+- commit and sync to master branch
+- create a version tag in master branch
+- checkout development on CoreLibs-composer-all branch
+- sync `php_libraries/trunk/www/lib/CoreLibs/*` to c`omposer-packages/CoreLibs-Composer-All/src/`
+- if phpunit files have been changed/updated sync them to `composer-packages/CoreLibs-Composer-All/test/phpunit/`
+- run phan/phpstan/phpunit tests in composer branch
+- commit and sync to master
+- create the same version tag as before in the trunk/master
+- GITEA
+  - download ZIP file from TAG
+  - `curl --user clemens.schwaighofer:KEY \
+     --upload-file ~/Documents/Composer/CoreLibs-Composer-All-vX.Y.Z.zip \
+     https://git.egplusww.jp/api/packages/Composer/composer?version=X.Y.Z`
+- GitLab
+  - `curl --data tag=vX-Y-Z --header "Deploy-Token: TOKENr" "https://gitlab-na.factory.tools/api/v4/projects/950/packages/composer"`
+- Composer Packagest local
+  - update pacakges.json file with new version and commit
+  - `git pull egra-gitea master`