chore(CI): Add Podfile to make travis happy for now

Podfile

@@ -0,0 +1,35 @@
+# NOTE: This Podfile is used to draw dependencies when building the project independently (e.g. for unit tests).
+
+use_frameworks!
+
+def common_deps
+    pod 'AlgoliaSearch-Client-Swift', '~> 4.8'
+end
+
+target "InstantSearchCore-iOS" do
+    common_deps
+end
+
+target "InstantSearchCore-iOS-Tests" do
+    common_deps
+end
+
+target "InstantSearchCore-macOS" do
+    common_deps
+end
+
+target "InstantSearchCore-macOS-Tests" do
+    common_deps
+end
+
+target "InstantSearchCore-tvOS" do
+    common_deps
+end
+
+target "InstantSearchCore-tvOS-Tests" do
+    common_deps
+end
+
+target "InstantSearchCore-watchOS" do
+    common_deps
+end