Don't report coverage for test files (#6979)

* Don't report coverage for test files
* Updated list of code coverage files
* Filter out generated parser files from coverage report
* Added code coverage badge to readme file
* Added version and license badges

---------

Co-authored-by: Michael Wilkerson-Barker <[email protected]>

Author: Brian Munkholm

README.md

@@ -1,3 +1,9 @@
+<p align="right">
+<a href='https://github.com/realm/realm-core/releases'><img src='https://img.shields.io/github/v/release/realm/realm-core' alt='Latest Release' /></a>
+<a href='https://coveralls.io/github/realm/realm-core'><img src='https://coveralls.io/repos/github/realm/realm-core/badge.svg' alt='Coverage Status' /></a>
+<a href='https://github.com/realm/realm-core'><img src='https://img.shields.io/github/license/realm/realm-core' alt='Source License' /></a>
+</p>
+
 ![Realm](doc/logo.png)
 
 Realm is a mobile database that runs directly inside phones, tablets or wearables - check out [realm.io](https://realm.io).

evergreen/config.yml

@@ -959,8 +959,12 @@ tasks:
             --service-flag-name="${coveralls_flag_name}" \
             --commit-sha="${github_commit}" \
             --vcs-branch="${branch_name}" \
+            --ignore='build/_deps/**' \
+            --ignore='build/external/**' \
             --ignore='external/**' \
             --ignore='src/external/**' \
+            --ignore='src/realm/parser/generated/**' \
+            --ignore='test/large_tests/**' \
             --parallel \
             --output-path=coveralls_${task_name}.json