spanner-jdbc: Step 01 - Create jdbc project

[olavloite]

Step 1: Create the project folder, pom and readme for the open source JDBC driver.

[kolea2]

LGTM but please also add to versions.txt (this will automatically increment the version number on releases).

[codecov]

Codecov Report

Merging #5805 into spanner-jdbc will decrease coverage by 0.67%.
The diff coverage is n/a.

@@ Coverage Diff @@## spanner-jdbc #5805 +/- ##
==================================================
- Coverage 46.79% 46.11% -0.68% + Complexity 25648 24187 -1461 
==================================================
Files 2456 2456 Lines 267593 262236 -5357 Branches 30564 29602 -962 ==================================================
- Hits 125228 120943 -4285 + Misses 133106 132179 -927 + Partials 9259 9114 -145

Impacted Files	Coverage Δ	Complexity Δ
.../java/com/google/cloud/testing/CommandWrapper.java	87.87% <0%> (-9.1%)	13% <0%> (ø)
.../cloud/datastore/testing/LocalDatastoreHelper.java	80.59% <0%> (-4.48%)	17% <0%> (ø)
...in/java/com/google/cloud/storage/StorageBatch.java	88% <0%> (-4%)	13% <0%> (ø)
...m/google/cloud/vision/v1/ImageAnnotatorClient.java	58.69% <0%> (-3.31%)	15% <0%> (-4%)
...e/cloud/vision/v1p4beta1/ImageAnnotatorClient.java	58.69% <0%> (-3.31%)	15% <0%> (-4%)
...age/contrib/nio/SeekableByteChannelPrefetcher.java	63.12% <0%> (-3.13%)	21% <0%> (-2%)
...gle/cloud/storage/testing/RemoteStorageHelper.java	61.98% <0%> (-3.06%)	9% <0%> (ø)
...e/cloud/vision/v1p3beta1/ImageAnnotatorClient.java	47.05% <0%> (-2.95%)	9% <0%> (-2%)
...e/cloud/vision/v1p2beta1/ImageAnnotatorClient.java	47.05% <0%> (-2.95%)	9% <0%> (-2%)
.../java/com/google/cloud/speech/v1/SpeechClient.java	48.57% <0%> (-2.78%)	10% <0%> (-2%)
... and 654 more

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[olavloite]

LGTM but please also add to versions.txt (this will automatically increment the version number on releases).

Added to versions.txt.

[kolea2]

Sorry for missing this - you can address this in the next commit, but this needs a space between the # and JDBC. Also, please capitalize Driver

[olavloite]

Sure, NP.