Branch rename cleanup (#976)

* Update pipeline build tag

The build status was still looking for a "master" branch, updated it to point to "main"

* Update ios.yml

* Update android.yml

* Update azure-pipelines.yml

* Update CONTRIBUTING.md

.github/workflows/android.yml

@@ -1,9 +1,9 @@
 name: CI_Android
 on:
   push:
-    branches: [ master ]
+    branches: [ main ]
   pull_request:
-    branches: [ master ]
+    branches: [ main ]
 
 jobs:
   Android:
@@ -47,4 +47,4 @@ jobs:
           adb shell find /data/local/tmp/tests -maxdepth 1 -exec chmod +x {} \\\;
 
       - name: Test
-        run: adb shell find /data/local/tmp/tests -name "*_tests" -maxdepth 1 -exec {} \\\;
+        run: adb shell find /data/local/tmp/tests -name "*_tests" -maxdepth 1 -exec {} \\\;

.github/workflows/ios.yml

@@ -1,9 +1,9 @@
 name: CI_iOS
 on:
   push:
-    branches: [ master ]
+    branches: [ main ]
   pull_request:
-    branches: [ master ]
+    branches: [ main ]
 
 jobs:
   iOS: