* add PAJ7620 local gesture recognize haas python example for esp32

* Issue commit 2: fixed #1622

Signed-off-by: Ncaiyan.cai <caiyan.cai@alibaba-inc.com>

[Detail]
none

[Verified Cases]
Build Pass: <none>
Test Pass: <none>

Signed-off-by: Ncaiyan.cai <caiyan.cai@alibaba-inc.com>

Signed-off-by: Ncaiyan.cai <caiyan.cai@alibaba-inc.com>

Signed-off-by: Ncaiyan.cai <caiyan.cai@alibaba-inc.com>

Signed-off-by: Ncaiyan.cai <caiyan.cai@alibaba-inc.com>

Signed-off-by: Ncaiyan.cai <caiyan.cai@alibaba-inc.com>

Signed-off-by: Ncaiyan.cai <caiyan.cai@alibaba-inc.com>

The pointer pbuf should be dereferenced but not used directly as a
pointer.

[Detail]
Issue description:
Function that returns non-void is missing a return value
Arriving at the end of a function without returning a value.

Solution:
Add return value at the end of function.

[Verified Cases]
Build Pass: eduk1_demo
Test Pass: eduk1_demo
Signed-off-by: NYilu Mao <yilu.myl@alibaba-inc.com>

[Detail]
Issue description:
An argument with the wrong type was passed to a print format specifier.
Argument "playback_stream_hdl" to format specifier "%x" was expected to have type "unsigned int" but has type "void *".

Solution:
add the type declaration for it.

[Verified Cases]
Build Pass: eduk1_demo
Test Pass: eduk1_demo

[Verified Cases]
Build Pass: py_engine_demo
Test Pass: py_engine_Demo
Signed-off-by: Nwangchengdong.wcd <wangchengdong.wcd@alibaba-inc.com>

Change the function as void return since it is same in linux adapter

* Update CONTRIBUTING.md

Signed-off-by: Ncaiyan.cai <caiyan.cai@alibaba-inc.com>

[Detail]
New VFS/POSIX APIs.
New userspace support.

[Verified Cases]
Build Pass: <helloworld_demo@haaseduk1>
Test Pass: <helloworld_demo@haaseduk1>

[Detail]
Improve termios and ioctl to provide more POSIX compatibility.
On console printing "\r\n" is no longer converted to "\r\r\n".

[Verified Cases]
Build Pass: helloworld_demo@haaseduk1
Test Pass: helloworld_demo@haaseduk1

[Detail]
HaaS100 flash driver for new driver framework.

[Verified Cases]
Build Pass: helloworld_demo@haas100
Test Pass: helloworld_demo@haas100

[Detail]
HaaS200 flash driver for new driver framework.

[Verified Cases]
Build Pass: helloworld_demo@haas200
Test Pass: helloworld_demo@haas200

[Detail]
Issue description:
Access fails after the same I2C device is opened for more than one time.
Rootcause:
PY-engine does not open an I2C device if it is already opened.
Solution:
Permit multiple open.

[Verified Cases]
Build Pass: <pyengine_demo@haaseduk1>
Test Pass: <pyengine_demo@haaseduk1>

[Detail]
OTA supports new flash API.

[Verified Cases]
Build Pass: helloworld_demo@haas200
Test Pass: helloworld_demo@haas200

[Detail]
HaaSEDUK1 flash driver for new driver framework.

[Verified Cases]
Build Pass: helloworld_demo@haaseduk1
Test Pass: helloworld_demo@haaseduk1

[Detail]
Fix the linking error: "undefined reference to TRACE_INIT" when trace is
enabled.

[Verified Cases]
Build Pass: <py_engine_demo>
Test Pass:  <py_engine_demo>

[Detail]
declaration is incompatible with previous "SYSVIEW_SendTaskInfo"
(declared
at line 75)

[Verified Cases]
Build Pass: <py_engine_demo>
Test Pass:  <py_engine_demo>

Signed-off-by: Ncaiyan.cai <caiyan.cai@alibaba-inc.com>

Signed-off-by: Ncaiyan.cai <caiyan.cai@alibaba-inc.com>

[Detail]
CWE476: All paths that lead to this null pointer comparison
already
dereference the pointer earlier

CWE570: An unsigned value can never be less than 0

[Verified Cases]
Build Pass: <py_engine_demo>
Test Pass:  <py_engine_demo>

Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>

Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>

Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>

Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>