Adding instructions to install from conda and build using CPM [skip-ci]

[cjnolet]

No description provided.

[cjnolet]

Adding a quick note to self on the updated example for the new API:

#include <raft/handle.hpp>
#include <raft/mdarray.hpp>
#include <raft/random/make_blobs.hpp>
#include <raft/distance/distance.hpp>

raft::handle_t handle;

int n_samples = 5000;
int n_features = 50;

auto input = make_device_matrix(handle, n_samples, n_features);
auto output = make_device_matrix(handle, n_samples, n_samples);

int n_centers = 5;
float cluster_std = 0.5;
raft::random::make_blobs(handle, input, n_centers, cluster_std);

auto metric = raft::distance::DistanceType::L2SqrtExpanded;
raft::distance::pairwise_distance(handle, input, input, output, metric);

(I guess we need to add mdarray overloads that take the handle directly)

[dantegd]

Overall great additions to the documentation

[cjnolet]

@gpucibot merge