Update README.md

README.md

@@ -14,7 +14,9 @@ let it shine on our screen! ✨✨
 - Get familiar with [Entry](./shared/src/commonMain/kotlin/com/bumble/puzzyx/model/Entry.kt) class and its types
 - Pick an Entry type you would like to add
 - Shout out to Droidcon what you want to say
-- Or get your cool/funny photo and add it to [Resources](./shared/src/commonMain/resources/participant)
+- Or get your cool/funny photo and add it to [Resources](./shared/src/commonMain/resources/participant). Image requirements are:
+    - Should be in landscape mode with ~1.5 ratio
+    - Should not be larger than 500 KB
 - Add your `Entry` instance to the list in [Entries.kt](./shared/src/commonMain/kotlin/com/bumble/puzzyx/model/Entries.kt)
 - Your tile is good to go! All you need to do is create your PR and ask Bumble team for review!
 
@@ -45,4 +47,4 @@ distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
-</pre>
+</pre>