perf build: Add build documentation
perf build: Add build documentation

Adding file describing the basics of perf build process.

Signed-off-by: Jiri Olsa <2c6594f608aa3d41e98d48846a6328831f7084ad@kernel.org>
Tested-by: Sukadev Bhattiprolu <2ac48ee9b8f6042694a5d86ef56b8e10fe5327d1@linux.vnet.ibm.com>
Tested-by: Will Deacon <b913f13ef92ac157955c954ccaaff7be065faba4@arm.com>
Cc: Alexis Berlemont <929519a3b1f6cab3695f673fbd450071fb320fcd@gmail.com>
Cc: Borislav Petkov <0691a664b24b6f15b20cd5aee64b72271db08be1@alien8.de>
Cc: Corey Ashford <d8c6f216c17042adc228efa9f1d34ca50bd37e4b@linux.vnet.ibm.com>
Cc: David Ahern <b80c1600f604d3b0d768f26f90a76757e76005dd@gmail.com>
Cc: Frederic Weisbecker <e8a1bf9163cb25e93cfd6540f223b3872ea7ee55@gmail.com>
Cc: Namhyung Kim <5c915a589b3ddf58cebf14bec41bcc143b37ac3c@kernel.org>
Cc: Paul Mackerras <19a0ba370c443ba08d20b5061586430ab449ee8c@samba.org>
Cc: Peter Zijlstra <3fddac958924aef220f202ca567388ddab3f14a8@infradead.org>
Cc: Stephane Eranian <f199ae9781930a5b94b284ca2f471140752002a7@google.com>
Link: 3273095e7225afc4a35e5e0d422ba6d09bab19c6@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <293abb6b76d7791c0732cc517d38c4b5c734b87f@redhat.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs