omni: Add README for the utils scripts

Change-Id: Ib120020835180061307ec4955903503fade6e569
diff --git a/utils/README.md b/utils/README.md
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+# How to use the scripts.
+
+1. You need to be on top level repo dir.
+
+2. Launch the scripts
+
+```
+cd vendor/omni/utils
+./aosp-merge.sh
+```
+
+ * Now enter to the desired aosp tag
+ * Wait for the script will finish
+
+ * If during the merge script you have some "MERGE CONFLICT", you need to resolve it first:
+        *Check the path of the repo conflict and type
+
+```
+cd ${path_to_repo}
+git status
+```
+
+ * Fix the files pb
+ * When it's done, type again:
+
+```
+git add .
+git commit --no-edit
+git checkout ${android_version}
+git merge ${branch-merge}
+```
+
+** Example like:
+   * ${path_to_repo} = frameworks/base
+   * ${android_version} = android-11
+   * ${branch-merge} = android-11.0.0_r37-merge where android-11.0.0_r37 is the aosp tag name used
+
+3. Pushing to Omnirom gerrit
+
+ * Go again to the Omni utils dir.
+
+```
+cd vendor/omni/utils
+./aosp-merge.sh
+```
+ * Enter now your username of your gerrit account.
+ * Enter the topicname for the merging stuff of the aosp tag
+ * Done.
+
+4. Repeat the whole "HOW TO" for the CAF script (Optional)
+
+ * But replace the aosp-merge.sh and aosp-merge.sh by caf-merge.sh and caf-merge.sh
+
+5. Enjoy :)
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