Add to this repo the same coverage checks as we have in core repo (#261…

…) (#292)

Added .codecov.yml, added badge to README.md

**Link to tracking Issue:** 
#261

.codecov.yml

@@ -0,0 +1,18 @@
+codecov:
+  notify:
+    require_ci_to_pass: yes
+  strict_yaml_branch: master  # only use the latest copy on master branch
+
+coverage:
+  precision: 2
+  round: down
+  range: "80...100"
+  status:
+    project:
+      default:
+        enabled: yes
+        target: 79%  # This needs to be updated to 85 or higher.
+    patch:
+      default:
+        enabled: yes
+        target: 95%

README.md

@@ -1,3 +1,18 @@
+<p align="center">
+  <a href="https://goreportcard.com/report/github.com/open-telemetry/opentelemetry-collector-contrib">
+    <img alt="Go Report Card" src="https://goreportcard.com/badge/github.com/open-telemetry/opentelemetry-collector-contrib?style=for-the-badge">
+  </a>
+  <a href="https://circleci.com/gh/open-telemetry/opentelemetry-collector-contrib">
+    <img alt="Build Status" src="https://img.shields.io/circleci/build/github/open-telemetry/opentelemetry-collector-contrib?style=for-the-badge">
+  </a>
+  <a href="https://codecov.io/gh/open-telemetry/opentelemetry-collector-contrib/branch/master/">
+    <img alt="Codecov Status" src="https://img.shields.io/codecov/c/github/open-telemetry/opentelemetry-collector-contrib?style=for-the-badge">
+  </a>
+  <a href="releases">
+    <img alt="GitHub release (latest by date including pre-releases)" src="https://img.shields.io/github/v/release/open-telemetry/opentelemetry-collector-contrib?include_prereleases&style=for-the-badge">
+  </a>
+</p>
+
 # OpenTelemetry Collector Contrib
 This is a repository for OpenTelemetry Collector contributions that are not part of the
 [core repository](https://github.com/open-telemetry/opentelemetry-collector) and