Move manifest repo to OHOS

meta-ohos and manifest moved from OSTC to OSTC/OHOS subgroup

Signed-off-by: Robert Drab <robert.drab@huawei.com>

README.md

@@ -21,7 +21,7 @@ To start working with **meta-ohos** first install git repo:
 Once git repo has been installed we can use it to clone the necessary repositories:
 
     $ mkdir ohos; cd ohos
-    $ repo init -u https://git.ostc-eu.org/OSTC/manifest.git
+    $ repo init -u https://git.ostc-eu.org/OSTC/OHOS/manifest.git
     $ repo sync
 
 Above commands should result in the following directory structure: