[portal,#59][l]: new portal package that (right now) presents a single dataset.

* What we have is a nextjs app for displaying a single dataset (+ tests, +fixtures etc)
* Also included are relevant generic components (e.g. a Chart and Table view) and some utilities for loading (Frictionless) datasets
* Not include (but to come) is the command line app

.github/workflows/examples-catalog-test.yml

@@ -0,0 +1,15 @@
+name: Jest-Tests  
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install modules
+      run: |
+        cd examples/catalog
+        yarn
+    - name: Run tests
+      run: |
+        cd examples/catalog
+        yarn test -u