Added age filter with range 1-20, 20-30, 30-40, 40-50, 50-60, 60-70 and 70 up

[error-yatish]

This is a reference to #112

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[sibeshkar]

Thanks. Few changes :

1. Make the Age node Icons bigger and increase edge length
2. Add icon legend
3. Modify age filter icon - maybe a clock icon will do

[error-yatish]

@sibeshkar I have committed below changes

1. Added Age node Icons and increased edge length
2. Added icons to legend
3. Changed age filter icon to Clock Icon

[sampathBlam]

@error-yatish :
Great implementation. Just a couple of suggestions.

1. All age groups seem to settle towards the centre of the cluster.

Can we move each group a bit away from each other so that each group is visible clearly? Like it happens for other filters? For eg, in case of state.

2. Can we group all cases whose age is not known, into a separate group ?

@sibeshkar : Your suggestions here would be appreciated as well.