Added readme for some info.

README.md

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+Urban explorer is an app which serves the knowledge about interesting places
+in the user's neighborhood.
+
+It fetches right now from two places - wiki API and panoramio API
+(which shows to have many downtimes). The another third is planned to be
+introduced due to low SLA level of panoramio.
+
+For changes introduces in the app versions look for @see changelog.md .
+For change requests, new features and bugs see the app's jira.
+
+Currently used libraries:
+- android sdk,
+- crashlytics (for bug reporting),
+- universal image loader
+- google support libs.